So how was this sweet animation made?

1. First off pick a background color
2. once you have done that create 3 different layers, each containing a circle of a different color
3. make keyframes in frame 12 for each layer
4. in the 12th frame, replace the circle for a square of the same color
5. set up your shape twee
6. after that just repeat the same process for the pentagon and back to the rectangle

Shape Tweens.fla