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Grogyan provided some Blender images that convince me a side position for the active sphere is not right. In the large image zoom in and you can see no opening in the sphere surface. The 'belt' that seems to fit the left and right halfs of the sphere together, has no openings. Presumably each sphere would have to have an opening somewhere in the belt area if the exit point is not in the sphere's axle.
Grogyan changed this image to show how he be lives the chair ride works and the missing parts of the Cyan model. The apparatus with gears on the sphere is his addition as is the vertical tube from the axle to the hub tube.
The chair ride would move down his vertical tube. Otherwise if one were to assume the Cyan model is correct and complete, we would then have to assume that we travel through the curved tube starts at the sphere axle and ends just above the pink hub. From there we drop down into the vogondala, which would be in the pink hub.
Since we only see the start and end of the chair ride, there is no way to know if we travel through a curve or not. My belief is Cyan took a short cut on the chair ride part of the trip and the model is complete.
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