"Lightbulb" uses a special bulb, inside which magnets and circuitry are hidden. Using a magnetic hall effect sensor, an electromagnet, and a feedback system, it floats a light bulb stably in the air, while power is transmitted wirelessly from the base of the sculpture into the bulb.
LEDs in the bulb rectify this AC power and convert it to light. The power transfer functions very similarly to how radio station tuning works and requires a well tuned matched pair of resonant windings, but allows power transmission over through the air.
Cool...I bet that's expensive...
