diff --git a/js/animation2a.js b/js/animation2a.js
index ef3f68b..29f4800 100644
--- a/js/animation2a.js
+++ b/js/animation2a.js
@@ -73,7 +73,8 @@ Animation2a.prototype.createGlobalGrid = function() {
     const bounds = this.container.getBoundingClientRect();
     const grid = new Grid();
 
-    for (let i = 0; i < 2; i++) {
+    const n = Random.num(1, 3);
+    for (let i = 0; i < n; i++) {
         const w = Random.num(50, 200);
         const h = Random.num(50, 200);
 
diff --git a/js/animation2b.js b/js/animation2b.js
index fffeea4..83df344 100644
--- a/js/animation2b.js
+++ b/js/animation2b.js
@@ -14,7 +14,7 @@ function Animation2b() {
 
     this.container = document.getElementById('animation2b');
     this.particles = [];
-    this.grid = createGlobalGrid(this.container, this.bounds);
+    this.grid = this.createGlobalGrid(this.container, this.bounds);
 
     const controls = new Controls(
         document.getElementById('controls2b'),
@@ -68,10 +68,12 @@ Animation2b.prototype.updateSpeed = function(value) {
     this.particles.forEach(p => p.updateConfig({ speed: value }));
 }
 
-function createGlobalGrid(container, bounds) {
+Animation2b.prototype.createGlobalGrid = function() {
+    const bounds = this.container.getBoundingClientRect();
     const grid = new Grid();
 
-    for (let i = 0; i < 2; i++) {
+    const n = Random.num(1, 3);
+    for (let i = 0; i < n; i++) {
         const w = Random.num(50, 200);
         const h = Random.num(50, 200);