David Merrill demos Siftables, the smart blocks | Video on TED.com
http://www.ted.com/talks/david_merrill_demos_siftables_the_smart_blocks.html

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The best way to describe Siftables might be "Blocks that can think." Visit the website to watch a TED presentation of these fantastic devices.

What are Siftables? Siftables are cookie-sized computers with motion sensing, neighbor detection, graphical display, and wireless communication. They act in concert to form a single interface: users physically manipulate them - piling, grouping, sorting - to interact with digital information and media. Siftables provides a new platform on which to implement tangible, visual and mobile applications.