No real reason for this video except there has been some talk about gimbals lately, with the usual problem how to visualise the rotating parts.
It reminded me of the little animation I did some time ago for my grandchildren. So here it is.
The innermost part is something like a chair with two of its edges corresponding to an axis. It helps to observe how the mutual relationship among the objects changes.
One play covers a 360 degree rotation.
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