If you're into the sciences, then you must check out the Gakken Kaleidoscope Projector Otona no Kagaku Vol 13 Adult Science Project Kit. The Kaleidoscope Projector is based on a device made in the 1800s, designed for people who love a challenge and like to build things.
The magazine with instructions is all written in Japanese but contains clear diagrams. After you build it, you can then project kaleidoscopic images onto your walls and amaze all your friends.
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