By now this is old hat to you. This happy face is the simplest frame in the whole animation because it doesn't need to transition to anything complex on either side. The orange cheek circles are not showing up even though they stay orange throughout the sequence, because they stay behind the mouth stroke all the way.

Objects that shrink maintain their same relative location with respect to the bounding box of their group. Since they were centered on the endpoints of the mouth, and the two smiles are located in nearly the same place in their two bounding boxes, the orange circles will stay under the mouth corners.

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