At the TED conference I saw an amazing demonstration from MIT's David Merrill, on his latest project called "siftables".

At a crude level, they look like electronic scrabble letters. As you arrange them into a word, they tell you when you're right. Then they reshuffle themselves by changing the letter on their display and you have a new array of letters to make a word with.  Sames goes for math equations, etc. Fun, easy table top game that I really wanted to play.

They can also be even smarter and be used as individual mixing channels to create and add to a sound track - tip a little of the drum siftable into the main chain that represents the melody and you've added a beat, or a little more bass. It's like having a range of ingredients in your hands, that you can mix and match with.

This video is a great introduction to these little squares that relate to and interact with each other - like absolute magic.