Rifle stock for wildlife/sports action. One problem: using this classifies your camera as an "assault weapon" and makes Diane Feinstein want to confiscate it.
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The Polyorama Panoptique, a 19th century optical device, a small-scale version of the diorama, simplified for home use. It is of a portable box-camera for viewing printed and painted cards with a viewing lens attached to a concertina device for adjustment. The card is inserted at the back of the box, which held up to the light, so that various effects are produced by illuminating the different textures and cut out parts of the card.
Retroscopes are portable 'peepshow' style viewers. You turn the crank to see the movie. Turn slowly to see step by step action; turn the crank quickly to see the motion zip by. The reels are removable so you can get extra movies.