UV technology could let users work together on handwritten notes and drawings.

Researchers from the University of Tokyo have created a digital tablet that looks like an ordinary piece of paper. The technology allows artists to freely draw on the sheet, before it’s placed under an ultraviolet projector overhead that can copy, erase, and share the artwork.

The sheet is a photochromic paper that works with Frixion’s heat-sensitive ink. When it’s placed under the overhead, the computer uses a camera, laser, and UV light to manipulate the sketch in real-time onto the paper.

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