| Start by creating a rectangle. |
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| Duplicate and place below. |
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| Create a tower of such rectangles. |
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| Select all layers and press Ctrl+G to group. Duplicate the group. |
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| Using rectangular marquee tool create a selection covering all the shapes. |
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| Fill it with a gradient. |
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| Change the layer mode to hue. |
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| Create another selection and fill with a new gradient. |
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| Change layer mode to color dodge. |
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| Hide a random number of rectangles from each group. Open animation window. Let this be your first frame of the animation. |
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| Duplicate the frame for second frame, unhide some of the hidden rectangles and hide some of the unhidden rectangles. |
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| Repeat the step to create more frames. |
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| Preview the animation by pressing play button in animation window. Press Ctrl+Alt+Shift+S to save an optimized GIF animation. |
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