Invisible Rube Goldberg machine - GIF

Invisible Rube Goldberg machine built by scientists from Japan's National Institute for Materials Science (NIMS). The contraption uses oil and glass with matching refractive indices.

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Previously:

https://www.homemadetools.net/forum/...469#post169913
https://www.homemadetools.net/forum/...478#post110676

That's great. I love it and want one.