diff --git a/angular.json b/angular.json
index 408a516..1779d21 100644
--- a/angular.json
+++ b/angular.json
@@ -35,7 +35,7 @@
                   "with": "src/environments/environment.prod.ts"
                 }
               ],
-              "optimization": false,
+              "optimization": true,
               "outputHashing": "all",
               "sourceMap": false,
               "extractCss": true,
@@ -47,8 +47,8 @@
               "budgets": [
                 {
                   "type": "initial",
-                  "maximumWarning": "2mb",
-                  "maximumError": "5mb"
+                  "maximumWarning": "20mb",
+                  "maximumError": "50mb"
                 }
               ]
             }
diff --git a/src/app/components/modal/modals/remove-tower/remove-tower.component.html b/src/app/components/modal/modals/remove-tower/remove-tower.component.html
index 639b547..83fdc83 100644
--- a/src/app/components/modal/modals/remove-tower/remove-tower.component.html
+++ b/src/app/components/modal/modals/remove-tower/remove-tower.component.html
@@ -6,9 +6,7 @@
 
   <p>
     You are trying to remove
-    <span [ngStyle]="{ color: modalService.active.input.baseColor | color }">{{
-      modalService.active.input.name ? modalService.active.input.name : 'an unnamed tower'
-    }}</span
+    <span [ngStyle]="{ color: tower.baseColor | color }">{{ tower.name ? tower.name : 'an unnamed tower' }}</span
     >.
   </p>
 
diff --git a/src/app/components/modal/modals/remove-tower/remove-tower.component.ts b/src/app/components/modal/modals/remove-tower/remove-tower.component.ts
index 45a3113..5444702 100644
--- a/src/app/components/modal/modals/remove-tower/remove-tower.component.ts
+++ b/src/app/components/modal/modals/remove-tower/remove-tower.component.ts
@@ -1,5 +1,6 @@
 import { Component } from '@angular/core';
 import { ModalService } from '../../../../services/modal.service';
+import { Tower } from '../../../../model/tower';
 
 @Component({
   selector: 'app-remove-tower',
@@ -8,4 +9,6 @@ import { ModalService } from '../../../../services/modal.service';
 })
 export class RemoveTowerComponent {
   constructor(public modalService: ModalService) {}
+
+  tower: Tower = this.modalService.active.input;
 }
diff --git a/src/app/components/modal/modals/settings/settings.component.html b/src/app/components/modal/modals/settings/settings.component.html
index e3714aa..3d893ae 100644
--- a/src/app/components/modal/modals/settings/settings.component.html
+++ b/src/app/components/modal/modals/settings/settings.component.html
@@ -9,11 +9,11 @@
     [beforeText]="'Hide create tower button'"
     [afterText]="'Show create tower button'"
     [default]="!page.userData.hideCreateTowerButton"
-    (value)="page?.setHideCreateTowerButton(!$event)"
+    (value)="page.setHideCreateTowerButton(!$event)"
   ></app-toggle>
 </div>
 <!-- wrapper for easier styling -->
 
-<p *ngIf="page.towers?.length == 5">There can be a maximum of <strong>5</strong> towers on each page.</p>
+<p *ngIf="page.towers.length == 5">There can be a maximum of <strong>5</strong> towers on each page.</p>
 
 <button (click)="deletePage()">Delete current page</button>
diff --git a/src/app/components/modal/modals/settings/settings.component.ts b/src/app/components/modal/modals/settings/settings.component.ts
index 5fcfe8c..09e470c 100644
--- a/src/app/components/modal/modals/settings/settings.component.ts
+++ b/src/app/components/modal/modals/settings/settings.component.ts
@@ -1,4 +1,4 @@
-import { Component } from '@angular/core';
+import { Component, OnInit } from '@angular/core';
 import { ModalService } from '../../../../services/modal.service';
 import { DataService } from '../../../../services/data.service';
 import { Page } from '../../../../model/page';
@@ -8,8 +8,10 @@ import { Page } from '../../../../model/page';
   templateUrl: './settings.component.html',
   styleUrls: ['./settings.component.scss']
 })
-export class SettingsComponent {
-  constructor(public modalService: ModalService, public dataService: DataService) {
+export class SettingsComponent implements OnInit {
+  constructor(public modalService: ModalService, public dataService: DataService) {}
+
+  ngOnInit() {
     this.modalService.active.input.subscribe(p => (this.page = p));
   }
 
diff --git a/src/app/components/pages/page/page.component.html b/src/app/components/pages/page/page.component.html
index 0a94a08..1697354 100644
--- a/src/app/components/pages/page/page.component.html
+++ b/src/app/components/pages/page/page.component.html
@@ -1,21 +1,21 @@
-<button *ngIf="page && page.towers.length < 5 && !page.userData?.hideCreateTowerButton" (click)="page.addTower()">
-  Create tower
-</button>
-
 <section class="towers" cdkDropList cdkDropListOrientation="horizontal" (cdkDropListDropped)="dropDrag($event)">
   <app-tower
-    *ngFor="let tower of page?.towers"
-    [tower]="tower"
-    [dateRange]="dateRange"
+    *ngFor="let tower of towers"
+    [tower$]="tower.asObservable()"
+    [dateRange$]="dateRange"
     cdkDrag
-    (cdkDragStarted)="startDrag(page.towers.indexOf(tower))"
+    (cdkDragStarted)="startDrag(towers.indexOf(tower))"
   ></app-tower>
+  <div *ngIf="(page$ | async)?.towers.length < 5 && !(page$ | async)?.userData?.hideCreateTowerButton">
+    <img src="assets/plus-sign.svg" alt="add tower" class="add-tower" (click)="page.addTower()" />
+  </div>
 </section>
 
 <img
   [ngClass]="isDragging ? 'active' : ''"
   src="assets/trash.svg"
   alt="trashcan"
+  class="trash"
   (pointerenter)="trashEnter()"
   (pointerleave)="trashExit()"
   (pointerup)="removeTower()"
@@ -26,7 +26,6 @@
     *ngIf="dates.length >= MIN_BLOCK_COUNT_BEFORE_SHOWING_SLIDER"
     [values]="dates"
     [labels]="dateLabels"
-    (lowerBound)="startDate = $event"
-    (upperBound)="endDate = $event"
+    (range)="dateRange.next($event)"
   ></app-double-slider>
 </div>
diff --git a/src/app/components/pages/page/page.component.scss b/src/app/components/pages/page/page.component.scss
index 58b5052..1fc1a77 100644
--- a/src/app/components/pages/page/page.component.scss
+++ b/src/app/components/pages/page/page.component.scss
@@ -24,13 +24,31 @@
 
     transition: box-shadow $short-animation-time;
 
+    max-width: 800px;
+
     &.cdk-drop-list-dragging {
       *:not(.cdk-drag-placeholder) {
         transition: transform $long-animation-time cubic-bezier(0, 0, 0.2, 1);
       }
     }
 
-    max-width: 800px;
+    div {
+      @include center-child();
+      img.add-tower {
+        height: 48px;
+        @media (max-width: $mobile-width) {
+          height: 32px;
+        }
+
+        opacity: 0.33;
+        transition: opacity $long-animation-time;
+        cursor: pointer;
+
+        &:hover {
+          opacity: 1;
+        }
+      }
+    }
 
     & > * {
       max-width: 200px;
@@ -65,7 +83,7 @@
     }
   }
 
-  img {
+  img.trash {
     @include square(48px);
     padding: 16px;
 
diff --git a/src/app/components/pages/page/page.component.ts b/src/app/components/pages/page/page.component.ts
index f8de9c7..e9467dd 100644
--- a/src/app/components/pages/page/page.component.ts
+++ b/src/app/components/pages/page/page.component.ts
@@ -1,58 +1,62 @@
-import { Component, EventEmitter, Input, Output } from '@angular/core';
+import { Component, EventEmitter, Input, OnInit, Output } from '@angular/core';
 import { Page } from '../../../model/page';
 import { ModalService } from '../../../services/modal.service';
 import { DataService } from '../../../services/data.service';
+import { Observable } from 'rxjs/internal/Observable';
+import { Range } from '../../../interfaces/range';
+import { Subject } from 'rxjs/internal/Subject';
+import { Tower } from '../../../model/tower';
+import { BehaviorSubject } from 'rxjs/internal/BehaviorSubject';
 
 @Component({
   selector: 'app-page',
   templateUrl: './page.component.html',
   styleUrls: ['./page.component.scss']
 })
-export class PageComponent {
-  private _page: Page;
-  @Input() set page(value: Page) {
-    if (!value) {
-      return;
-    }
+export class PageComponent implements OnInit {
+  @Input() page$: Observable<Page>;
+  private page: Page;
 
-    this._page = value;
-    this.updateDates();
-  }
+  towers: Array<BehaviorSubject<Tower>> = [];
 
   @Output() isDragHappening: EventEmitter<boolean> = new EventEmitter();
 
-  get page(): Page {
-    return this._page;
-  }
-
-  readonly MIN_BLOCK_COUNT_BEFORE_SHOWING_SLIDER = 3;
+  readonly MIN_BLOCK_COUNT_BEFORE_SHOWING_SLIDER = 6;
 
   isDragging = false;
   draggedTowerIndex: number;
   nearTrashcan = false;
 
   dates: Date[] = [];
-  startDate: Date;
-  endDate: Date;
+  dateRange: Subject<Range<Date>> = new Subject<Range<Date>>();
 
   get dateLabels(): string[] {
     return this.dates.map(d => d.toLocaleDateString());
   }
 
-  get dateRange(): { from: Date; to: Date } {
-    return this.dates.length >= this.MIN_BLOCK_COUNT_BEFORE_SHOWING_SLIDER
-      ? {
-          from: this.startDate,
-          to: this.endDate
-        }
-      : {
-          from: new Date(0, 0),
-          to: new Date(10000, 0)
-        };
-  }
-
   constructor(private modalService: ModalService, public dataService: DataService) {}
 
+  ngOnInit(): void {
+    this.page$.subscribe(value => {
+      if (value) {
+        this.towers = value.towers.map((t, index) => {
+          if (index < this.towers.length) {
+            if (this.towers[index].getValue() !== t) {
+              this.towers[index].next(t);
+            }
+            return this.towers[index];
+          }
+          return new BehaviorSubject(t);
+        });
+
+        this.page = value;
+        this.dates = value.towers
+          .reduce((all, t) => [...t.blocks.map(b => b.created), ...all], [])
+          .sort((d1, d2) => d1.getTime() - d2.getTime());
+      }
+    });
+  }
+
   dropDrag(event: any) {
     this.page.moveTower(event);
     this.isDragging = false;
@@ -88,10 +92,4 @@ export class PageComponent {
       // pass
     }
   }
-
-  private updateDates() {
-    this.dates = this.page.towers
-      .reduce((all, t) => [...t.blocks.map(b => b.created), ...all], [])
-      .sort((d1, d2) => d1.getTime() - d2.getTime());
-  }
 }
diff --git a/src/app/components/pages/page/tower/tasks/tasks.component.html b/src/app/components/pages/page/tower/tasks/tasks.component.html
index afe2543..4355c5f 100644
--- a/src/app/components/pages/page/tower/tasks/tasks.component.html
+++ b/src/app/components/pages/page/tower/tasks/tasks.component.html
@@ -1,4 +1,4 @@
-<div class="container {{ tasks.length > 0 ? 'show-hover' : '' }}">
+<div *ngIf="tasks" class="container {{ tasks.length > 0 ? 'show-hover' : '' }}">
   <p class="header" (click)="isOpen = !isOpen">
     <strong>
       {{ tasks.length == 0 ? '' : tasks.length }}
diff --git a/src/app/components/pages/page/tower/tower.component.html b/src/app/components/pages/page/tower/tower.component.html
index de6bcaf..3bcad7e 100644
--- a/src/app/components/pages/page/tower/tower.component.html
+++ b/src/app/components/pages/page/tower/tower.component.html
@@ -1,14 +1,20 @@
-<div class="tower">
+<div class="tower" *ngIf="tower$ | async">
   <div class="container">
     <div class="tasks-container">
-      <app-tasks [tasks]="tasks" [tower]="tower"></app-tasks>
+      <app-tasks [tasks]="tasks" [tower]="tower$ | async"></app-tasks>
     </div>
 
     <img src="assets/plus-sign.svg" alt="add item" (click)="addBlock()" />
 
     <div class="block-container-container">
-      <div class="block-container falling">
-        <app-block *ngFor="let block of drawableBlocks" [block]="block" [tower]="tower"></app-block>
+      <div class="block-container" *ngIf="blocks.length > 0">
+        <app-block
+          [ngClass]="block.cssClass"
+          [ngStyle]="block.style"
+          *ngFor="let block of drawableBlocks"
+          [block]="block"
+          [tower]="tower$ | async"
+        ></app-block>
       </div>
     </div>
   </div>
@@ -19,6 +25,6 @@
     type="text"
     placeholder="name…"
     [(ngModel)]="towerName"
-    [ngStyle]="{ color: tower?.baseColor | color }"
+    [ngStyle]="{ color: (tower$ | async)?.baseColor | color }"
   />
 </div>
diff --git a/src/app/components/pages/page/tower/tower.component.scss b/src/app/components/pages/page/tower/tower.component.scss
index 931af89..9d333fc 100644
--- a/src/app/components/pages/page/tower/tower.component.scss
+++ b/src/app/components/pages/page/tower/tower.component.scss
@@ -121,23 +121,17 @@
           bottom: 0;
           width: 100%;
           transform: scaleY(-1);
-          &.falling > *:last-child {
-            animation: falling 1.5s cubic-bezier(0.5, 0, 1, 0) forwards;
 
-            @keyframes falling {
-              0% {
-                opacity: 0;
-                transform: translateY(500%);
-              }
+          * {
+            transform: translateY(500%);
+          }
 
-              50% {
-                opacity: 1;
-              }
+          .descend {
+            transition: transform 1.5s cubic-bezier(0.5, 0, 1, 0), opacity 500ms cubic-bezier(0.5, 0, 1, 0);
+          }
 
-              100% {
-                transform: translateY(0);
-              }
-            }
+          .ascend {
+            transition: transform 1.5s cubic-bezier(0.5, 0, 1, 0), opacity 500ms cubic-bezier(0.5, 0, 1, 0) 1s;
           }
         }
       }
diff --git a/src/app/components/pages/page/tower/tower.component.ts b/src/app/components/pages/page/tower/tower.component.ts
index 0f463c2..6f01947 100644
--- a/src/app/components/pages/page/tower/tower.component.ts
+++ b/src/app/components/pages/page/tower/tower.component.ts
@@ -1,52 +1,98 @@
-import { Component, Input } from '@angular/core';
+import { Component, Input, OnInit } from '@angular/core';
 import { ColoredBlock, Tower } from '../../../../model/tower';
 import { ModalService } from '../../../../services/modal.service';
+import { Observable } from 'rxjs/internal/Observable';
+import { Range } from '../../../../interfaces/range';
+import { top } from '../../../../utils/top';
+
+type StyledBlock = ColoredBlock & { style: { [p: string]: string }; shouldDraw: boolean; cssClass: string };
 
 @Component({
   selector: 'app-tower',
   templateUrl: './tower.component.html',
   styleUrls: ['./tower.component.scss']
 })
-export class TowerComponent {
+export class TowerComponent implements OnInit {
+  @Input() dateRange$: Observable<Range<Date>>;
+  private dateRange: Range<Date>;
+
+  @Input() tower$: Observable<Tower>;
+  private tower: Tower;
+
   get towerName(): string {
-    return this.tower.name;
+    return this.tower ? this.tower.name : 'Loading…';
   }
 
   set towerName(value: string) {
     this.tower.changeName(value);
   }
 
-  @Input() set dateRange(value: { from: Date; to: Date }) {
-    if (this.dateRange !== undefined && this.dateRange.from === value.from && this.dateRange.to === value.to) {
-      return;
-    }
-    this._dateRange = value;
-  }
-
-  get dateRange(): { from: Date; to: Date } {
-    return this._dateRange;
+  tasks: Array<ColoredBlock>;
+  blocks: Array<StyledBlock> = [];
+  get drawableBlocks(): Array<StyledBlock> {
+    return this.blocks.filter(b => b.shouldDraw);
   }
 
   public constructor(private modalService: ModalService) {}
 
-  get drawableBlocks(): Array<ColoredBlock> {
-    return this.tower.coloredBlocks.filter(
-      block => this.dateRange.from <= block.created && block.created <= this.dateRange.to && block.isDone
-    );
+  ngOnInit() {
+    this.tower$.subscribe(value => {
+      if (value) {
+        this.blocks = value.coloredBlocks
+          .filter(b => b.isDone)
+          .map(b => {
+            let classedBlock = b as StyledBlock;
+            classedBlock.shouldDraw = true;
+            classedBlock.style = { transform: 'translateY(0)', opacity: '1' };
+            classedBlock.cssClass = '';
+            return classedBlock;
+          });
+
+        if (this.tower) {
+          let difference = this.tower.blocks.map((b, index) => {
+            return b === value.blocks[index];
+          });
+
+          if (
+            (difference.every(i => i) && this.tower.blocks.length < value.blocks.length) ||
+            this.tower.blocks.filter(b => b.isDone).length + 1 === value.blocks.filter(b => b.isDone).length
+          ) {
+            const lastBlock = top(this.blocks);
+            if (lastBlock) {
+              lastBlock.style = { opacity: '0' };
+              lastBlock.cssClass = 'descend';
+              setTimeout(() => (lastBlock.style = { transform: 'translateY(0)', opacity: '1' }), 0);
+            }
+          }
+        }
+
+        this.tasks = value.coloredBlocks.filter(block => !block.isDone);
+
+        this.tower = value;
+      }
+    });
+
+    this.dateRange$.subscribe(dateRange => {
+      this.initData(dateRange);
+      this.dateRange = dateRange;
+    });
   }
 
-  get tasks(): Array<ColoredBlock> {
-    return this.tower.coloredBlocks.filter(
-      block => this.dateRange.from <= block.created && block.created <= this.dateRange.to && !block.isDone
-    );
+  initData(newDateRange: Range<Date>) {
+    for (const block of this.blocks) {
+      block.shouldDraw = newDateRange.from <= block.created;
+
+      if ((block.cssClass === '' || block.cssClass === 'descend') && newDateRange.to < block.created) {
+        block.cssClass = 'ascend';
+        block.style = { transform: 'translateY(500%)', opacity: '0' };
+      }
+      if (block.shouldDraw && block.cssClass === 'ascend' && block.created < newDateRange.to) {
+        block.cssClass = 'descend';
+        block.style = { transform: 'translateY(0)', opacity: '1' };
+      }
+    }
   }
 
-  @Input() tower: Tower;
-
-  _dateRange: { from: Date; to: Date };
-
-  isFalling = true;
-
   public async addBlock() {
     try {
       const { selected: tag, description, isDone } = await this.modalService.showCreateBlock({
diff --git a/src/app/components/pages/pages.component.html b/src/app/components/pages/pages.component.html
index d6c427f..4fcaef9 100644
--- a/src/app/components/pages/pages.component.html
+++ b/src/app/components/pages/pages.component.html
@@ -2,8 +2,8 @@
   <!-- wrapper for easier styling -->
   <app-select-add
     [options]="pageNames"
-    [default]="selectedPageName"
-    (value)="selectPage($event)"
+    [default]="(selectedPage$ | async).name"
+    (value)="selectedPageName = $event"
     [placeholder]="'Add a new page…'"
   ></app-select-add>
 </div>
@@ -11,7 +11,7 @@
 
 <div class="page-container">
   <!-- wrapper for easier styling -->
-  <app-page *ngIf="selectedPage" [page]="selectedPage" (isDragHappening)="isDragHappening = $event"></app-page>
+  <app-page [page$]="selectedPage$" (isDragHappening)="isDragHappening = $event"></app-page>
 </div>
 <!-- wrapper for easier styling -->
 
diff --git a/src/app/components/pages/pages.component.ts b/src/app/components/pages/pages.component.ts
index c006b5a..8e6a9af 100644
--- a/src/app/components/pages/pages.component.ts
+++ b/src/app/components/pages/pages.component.ts
@@ -27,19 +27,6 @@ export class PagesComponent {
     return [];
   }
 
-  get selectedPage(): Page {
-    try {
-      return this.pages[this.pageNames.indexOf(this.selectedPageName)];
-    } catch {
-      return null;
-    }
-  }
-
-  private _selectedPageName: string;
-  get selectedPageName(): string {
-    return this._selectedPageName;
-  }
-
   set selectedPageName(value: string) {
     window.localStorage.setItem(
       USER_DATA_KEY,
@@ -47,7 +34,8 @@ export class PagesComponent {
         selectedPage: value
       })
     );
-    this._selectedPageName = value;
+    const index = this.pageNames.indexOf(value);
+    this._selectedPage.next(index >= 0 ? this.pages[0] : null);
   }
 
   private readonly _selectedPage: BehaviorSubject<Page> = new BehaviorSubject(null);
@@ -56,28 +44,22 @@ export class PagesComponent {
   constructor(public dataService: DataService, private modalService: ModalService) {
     const userData = JSON.parse(window.localStorage.getItem(USER_DATA_KEY));
     if (userData !== null && userData.selectedPage !== undefined) {
-      this._selectedPageName = userData.selectedPage;
+      this.selectedPageName = userData.selectedPage;
     }
 
-    this.dataService.safeChildren$.subscribe(pages => {
+    this.dataService.children$.subscribe(pages => {
       if (pages) {
         this.pages = pages;
-        if (!this.selectedPage) {
-          this.selectedPageName = this.pages.length > 0 ? this.pages[0].name : null;
+        if (!this._selectedPage.getValue() && this.pages.length > 0) {
+          this.selectedPageName = this.pages[0].name;
+        } else if (this._selectedPage.getValue()) {
+          // To trigger update on new page.
+          this.selectedPageName = this._selectedPage.getValue().name;
         }
-        this._selectedPage.next(this.selectedPage);
       }
     });
   }
 
-  async selectPage(selected: string) {
-    if (!this.pageNames.includes(selected)) {
-      this.dataService.addPage(selected);
-    }
-    this.selectedPageName = selected;
-    this._selectedPage.next(this.selectedPage);
-  }
-
   async openSettings() {
     try {
       await this.modalService.showSettings(this.selectedPage$);
diff --git a/src/app/components/shared/double-slider/double-slider.component.ts b/src/app/components/shared/double-slider/double-slider.component.ts
index d9318c4..9a0278c 100644
--- a/src/app/components/shared/double-slider/double-slider.component.ts
+++ b/src/app/components/shared/double-slider/double-slider.component.ts
@@ -1,5 +1,6 @@
 import { Component, EventEmitter, Input, Output } from '@angular/core';
 import { range } from '../../../utils/range';
+import { Range } from '../../../interfaces/range';
 
 @Component({
   selector: 'app-double-slider',
@@ -49,8 +50,7 @@ export class DoubleSliderComponent {
 
   private _values: any[];
 
-  @Output() lowerBound: EventEmitter<any> = new EventEmitter();
-  @Output() upperBound: EventEmitter<any> = new EventEmitter();
+  @Output() range: EventEmitter<Range<any>> = new EventEmitter();
 
   drawnLabels: string[];
 
@@ -93,12 +93,16 @@ export class DoubleSliderComponent {
   }
 
   private emitValue() {
-    if (this.oneValue < this.otherValue) {
-      this.lowerBound.emit(this.values[this.indexFromValue(this.oneValue)]);
-      this.upperBound.emit(this.values[this.indexFromValue(this.otherValue)]);
-    } else {
-      this.lowerBound.emit(this.values[this.indexFromValue(this.otherValue)]);
-      this.upperBound.emit(this.values[this.indexFromValue(this.oneValue)]);
-    }
+    const range = {
+      from:
+        this.oneValue < this.otherValue
+          ? this.values[this.indexFromValue(this.oneValue)]
+          : this.values[this.indexFromValue(this.otherValue)],
+      to:
+        this.oneValue < this.otherValue
+          ? this.values[this.indexFromValue(this.otherValue)]
+          : this.values[this.indexFromValue(this.oneValue)]
+    };
+    this.range.emit(range);
   }
 }
diff --git a/src/app/components/shared/select-add/select-add.component.ts b/src/app/components/shared/select-add/select-add.component.ts
index d52f4d3..5cc5af7 100644
--- a/src/app/components/shared/select-add/select-add.component.ts
+++ b/src/app/components/shared/select-add/select-add.component.ts
@@ -59,12 +59,12 @@ export class SelectAddComponent {
       this.select(this.newOption);
       this.newOption = '';
     }
+    this.toggle();
   }
 
   select(option: string) {
     this.selected = option;
     this.value.emit(this.selected);
-    this.toggle();
   }
 
   toggle() {
diff --git a/src/app/interfaces/persistance/page.ts b/src/app/interfaces/persistance/page.ts
index 43dd10a..75d9bf7 100644
--- a/src/app/interfaces/persistance/page.ts
+++ b/src/app/interfaces/persistance/page.ts
@@ -1,4 +1,5 @@
 import { ITower } from './tower';
+import { Range } from '../range';
 
 export interface IPage {
   name: string;
@@ -6,9 +7,6 @@ export interface IPage {
 
   userData: {
     hideCreateTowerButton?: boolean;
-    defaultDateRange?: {
-      from: Date;
-      to: Date;
-    };
+    defaultDateRange?: Range<Date>;
   };
 }
diff --git a/src/app/interfaces/range.ts b/src/app/interfaces/range.ts
new file mode 100644
index 0000000..ecbb43d
--- /dev/null
+++ b/src/app/interfaces/range.ts
@@ -0,0 +1,4 @@
+export interface Range<T> {
+  from: T;
+  to: T;
+}
diff --git a/src/app/services/data.service.ts b/src/app/services/data.service.ts
index e939076..0bd0771 100644
--- a/src/app/services/data.service.ts
+++ b/src/app/services/data.service.ts
@@ -41,11 +41,17 @@ export class DataService extends Root<Page> {
         childrenConstructor: null
       }
     };
+
     for (let page of pages) {
       new Page(this, page);
     }
+    setTimeout(() => {
+      this.children$.subscribe(value => {
+        this.log();
+      });
+    }, 0);
+
     this.children$.subscribe(value => {
-      this.log();
       this._safeChildren.next(value);
       this.save(0);
     });
@@ -60,11 +66,12 @@ export class DataService extends Root<Page> {
   }
 
   addPage(name: string) {
-    new Page(this, {
+    const page = new Page(this, {
       name,
       userData: {},
       towers: []
     });
+    page.addTower();
   }
 
   removePage(page: Page) {
diff --git a/src/app/services/store.service.ts b/src/app/services/store.service.ts
index 2a029a8..b574e0c 100644
--- a/src/app/services/store.service.ts
+++ b/src/app/services/store.service.ts
@@ -49,13 +49,13 @@ export class StoreService<T> {
               isDone: false
             },
             {
-              created: new Date(2020, 2, 15),
+              created: new Date(2019, 3, 15),
               tag: 'go to school',
               description: 'done it',
               isDone: true
             },
             {
-              created: new Date(2021, 2, 15),
+              created: new Date(2019, 3, 15, 19),
               tag: 'go to school',
               isDone: false
             }