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If anyone here remembers the George Pal movie The Time Machine, they might remember the "speaking rings" that simply needed to be placed on a table and spun with a hand, in order to speak. The beauty of the rings were that the recording, and the replay system, were self-contained, requiring only kinetic energy to function.
This is the optimum goal for any sound (or motion) based recording system: Making sure it can essentially play itself, powered by the simplest of energy sources.
So here's an idea: A holographic crystal is placed in the sun. Sunlight passes through the crystal, and illuminates a discrete holographic image at that particular angle. As the sun moves in the sky, it illuminates a new image at each angle... if you can pack enough holographic information to create, say, 30 images for each second of the sun's motion, you have a movie. (Okay... I am writing this one down...)
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