A fun (and funny!) 9-minute video from Linternet User about designing a perfect onscreen lever with the right amount of juice:

Love seeing real work in progress like that, plus it ends up in a place I didn’t expect.

It was also great to see “delay and snap” action elucidated so clearly. It feels like a variant of rubberbanding (or, elastic scrolling) where you intentionally disconnect an object from the cursor or finger dragging it.