From a posting made by Raymond Chen on his blog (
http://blogs.msdn.co...7/10/31/5788081.aspx), there's a group making magic wands that use accelerometers to detect certain motions or taps and can display messages in the air based on those motions:
http://www.rawbw.com/~acorn/wand/The wand is a magical device for casting spells. Spells are cast by either waving the wand around or tapping the wand on a hard surface.
...
When a spell is successfully cast on the wand, the wand replies with a message. Messages are viewed by waving the wand quickly back and forth in front of you. Glowing gems display the message in red letters in midair.
Pretty neat!
edited: please attach screenshots to interesting posts like this:
