The pressure-sensitive DeLighTable lights up when you rub your hand across it. If you set down a glass the drink will glow from beneath. The actual surface is only 2 cm thick and runs on 12 volts of energy. They're made to order from KLOSS and start at $2,300. There's a video demonstration after the jump, but it leaves something to be desired. It kind of reminds me of my friend's pressure-sensitive table. It was made out of wood, and was pressure sensitive to car keys and pocket knives. Very long lasting. I bet some of my best penis doodles are still visible to this day.
Video after the touch.