This model is a departure from my normal scale choice: I wanted something that minifigs could enjoy for a change instead of something only 1-2-3 Marie could enjoy. ;-) This ride was really just a 'see if it can work' type project, although the ride itself has significant memories for me from my childhood. The ride itself is simply a circular platform on which the riders seats are set on the outer rim. The frame induces bidirectional motion that causes the wheel to rotate as well as undulate in a wave type fashion(depending on operation mode). The wave motion is caused by the reverse rotation of the mid-carriage that sits on the base between the wheel and its lifting arm.