Create a digital picture frame that will continuously display a slideshow of pictures. Use solar power (ambient light) only, so it works forever.
E-Ink is probably the way to go, though we perhaps need artwork and pictures suited for its monochromaticity. Halftoning.
The frame rate is limited by available power. No one can see it in the dark, anyway.
Colored E-Ink (by competitors?) might be happening soon, if not already.
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