h a l f b a k e r y
I never imagined it would be edible.
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Featuring a zorb-like unidirectional treadmill and three motors facing in each of three directions, this apparatus adjusts its weight to precisely counterbalance a person standing on top. If the person walks, it moves accordingly in whichever direction, such that the person looks as if he is walking
||Is the walker inside the zorb, or on top?
||He's on top. Although a version with the zorb on top with the walker may be fun in rain or storms. On the down side it would also be safer.