A gutted light bulb, a neodymium magnet, paraffin oil. Put them together and you have Sergio Silva's incredible Oyule Lamp Set. The concept is lovely–to take modern technology back in time, but still put it to its "original" use.
The $650 price tag is nutty, because however good the art is, the idea is free. On the other hand, it's perhaps the case that this $650 is also buying you a configuration that's been properly tested, and won't end up showering your face in napalm and shattered glass.