Ok, in truth it's not exactly that, but that's the nickname it got. It's a self-stabilizing platform. It doesn't matter the angle you put the lower platform in, the upper platform will ever stay in the horizontal position. I used the method from this post , by Lauzsus, and adapted to my needs, incl…

Self balancing waiter tray. (or almost it)

system August 8, 2011, 3:38am 2

It needs to go on a roller coaster for testing

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