This LEGO rocking vehicle appears to have a mind of its own, but it’s actually only powered by gravity and a small motor. Custom LEGO builder JK Brickworks walks us through the build in a YouTube video, which was actually inspired by the old school Bear Mobill toy made by Bandai in 1987. Looks like the original toy was supposed to be some sort of sci-fi military vehicle, but JK Brickworks gives it a flashy new look.

The hypnotic flipping motion is triggered by a cart moving forward in the center. He weighs the machine down just enough at the end of his track, causing the build to flip over on two legs, resetting the whole process. As shown in the JK Brickworks video, the toy’s unique rolling motion allows it to climb small steps and even climb a slight incline.

If you want a more in-depth look at how to build this weirdly satisfying flippy machine, you can check out the nearly two-hour recorded live stream of JK Brickworks putting it together piece by piece. It looks like JK Brickworks also plans to create detailed building instructions, as he notes “instructions will be forthcoming” in the description of his design overview video.

Sure, the machine may be useless and have an unnecessarily nasty way of moving, but it’s interesting that such a vehicle even exists. As some users on Reddit have pointed out, the only toy that comes close to this level of intrigue is probably the He-Man dragon walker from 1983, which swings sideways to take a single step forward.

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