We're going through a wild west phase of UI ("UX") design where motion is being integrated into user interfaces in wild and crazy ways. Eventually a consensus w

We're going through a wild west phase of UI ("UX") design where motion is being integrated into user interfaces in wild and crazy ways. Eventually a consensus will emerge (in the past, this has usually been driven by Apple either standardizing on something, like slide to open or elastic-banding) and we'll get library support for a standard "create a new item" "destroy an item" "create a child item" "establish a relationship" and so on. In many cases, there are already contenders, and you're probably better off picking whatever looks like a standard and imitating it. The upshot is that we're in a period of flux, but eventually standards will emerge and "motion design" will be largely a matter of UI standards and style guides, just as "button design" is today.