Interactive LED Dining table
Dining table with a frosted glass top lit by 448 LEDs that respond, in a complex and gentle fashion, to input generated by motion above the table while we eat.
This table was demonstrated at the MakerFaire ( makezine.com/faire/ ) in April 2006. More info here.
Update (May, 2007): We have some new interactive coffee tables. You can even buy one if you want to.
Update (June, 2008): Schematic released as a free design.