Artists: Ingo Maurer

Okay - so he's not really an interactive artist, but he does a lot of beautiful product design using glass and lights. His techniques for setting LEDs into laminated glass are great (you really can hardly see any wires).
See http://www.ingo-maurer.com/ - go to Products, and LED Lamps, then the LED Bench. Sarah - many cool architectural projects in here too. The LED Bench, 2002