At his blog, The Blind Giant, Nick Harkaway has brought attention to something called ZeroN; it is a so-called 'levitated interaction element,' built at MIT, and promises to become the future user interface:
This is the ZeroN.
There’s an article about it here. It’s a prototype. It wobbles a bit. But if you don’t find it amazing, you need to step back and refresh your sense of wonder.
Done that? Okay.
Floating ball. Gravity nullified by electromagnetism. You are living in the future now, yes?