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That's what I mean. Rotating around their axis, which is spinning. Like the world rotates or spins. And by wheels I also mean disk, probably disks is more precise just as the spinning but really don't see why anyone would be confused when there's a video.

But anyway, thanks for improving my English.

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English isn't my first language but if it people were referring the motion as spinning instead of rotating and discs instead of wheels it wouldn't be confusing.

(Text here is removed due to bad wording.)

To mrtksn: yeah I think your original post is pretty clear. But there are indeed other comments in this thread that are confusing the two.

Yeah probably but there's a minutes long video with close ups.

In my mental model its wheels attached in different way that rotate around an axis perpendicular to the ground. I call in wheels because moves the things around.

I'm really confused by the confusion. Isn't it obvious on the video that its cylindrical objects that can be considered thick disks and wouldn't all disks rotate on the round surface around the axis?

I also found the close up video to be self explanatory but I understand the confusion. People are thinking of it as multiple tiny treadmills that change direction rather than the spinning disc it actually is.

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