Animated GIF

I created two types of colour layers.

This is the second layer with pink colour.

I created the little rectangles using rectangle tool, selected them with command key + T and rotated them randomly.

In this one, I change some of the rectangles to pink and group all the rectangles shapes named it shapes 1.

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These are 4 different movements of the rectangles to make the GIF.

This is a screen shot of 6 different movements of the shapes appearing together.

I made 6 layers in timeline.