Pop

Pop treats the object like a balloon under rising pressure. It inflates while bulging unevenly, one way then the other, the wobble getting faster as the pressure builds, then bursts to nothing in a few frames. The way back is the reverse in spirit: it pops out of nothing, overshoots past full size and rings down like jelly until it is exactly at rest.

How it works

The inflating object does not just grow evenly. Two different bulges alternate across its width and height, driven faster and faster, so it looks strained before the burst. The burst itself is one last swell and then a collapse within roughly the final sixth of the duration. On the return a quick spring takes it past full size, and the ringing alternates which way it bulges before settling.

Settings

• Inflate: how much bigger it gets before it bursts.
• Wobble: how unevenly it bulges.
• Rings: how many wobbles it makes as it settles on the way back.
• Duration: the length of the burst, and of the return.

Use it for

Celebrations, game rewards, kids' content, collectible reveals and any button that should feel satisfying to press. Use it on click or hover (clicking again brings the object back), inside an action, or as the object's entrance and exit when it is shown or hidden. For a squash that stays in place, use Jelly; for the same springy arrival from above, try Slam.