My stereopticon. I thought it might work when I needed 3-D glasses to see the 3-D productions of a creative co-worker, Andrew Maloney. It did. (But I have to make sure I don’t poke the laptop screen!) If you've got one of these lying around the house, and I don't know why you wouldn't, check his stuff out. Throw-away 3-D glasses from the Film Forum work too, as long as you never threw them away.
The best co-workers turn out to have real lives beyond the office or shop, and Andrew is no exception. He also does magic for kids, although I don't see why adults wouldn't enjoy it. I did.