Here is another picture from TIME, 
one of its list of the 25 best inventions of 2016. It’s a levitating LED light bulb. And does it have a battery in the base? Nope. There’s a wire for electricity that goes into the base, but then the light emitting diode (LED) is lit up by magnetic induction. Such a special light bulb comes at a price of course: $359. (But I want one).