This is a mason jar fitted out with a solar pane that charges a battery that lights some LED lights with a lovely firefly glow. It's like a jar of summer fireflies without the useless insect death guilt! I want one so bad.
The website I found it at, Daytrip Society, is a store full of cute outdoorsy things based in the Bush-vacation-home town of Kennebunkport, Maine. I found the store via the cute blog Abbey Goes Design Scouting. The "main house" of the Bush compound (!!!):