The Man With the Lightbulb Head

This is way cool: who wouldn't want a floating lightbulb? I'll take that bus, and I'll even get off at the next station: how about a radio-controlled floating light bulb that you can have follow you around the house? Huh? HUH?

But, translation please:

Lightbulb uses a special bulb, inside which magnets and circuitry are hidden. Using a magnetic hall effect sensor, an electromagnet, and a [modified] PD feedback system, it floats a lightbulb 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.