Rotation through Radial Translations

The whole image appears to be rotating when the points translate back and forth along lines radiating from the center.
This applies to the fact that a hypocycloid traced by a circle of radius 1 rolling inside a circle of radius 2 is a straight line [1].

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Reference
[1] "How Does a Hypocycloid Straight-Line Mechanism Work?" (Jan 8, 2014) www.mekanizmalar.com/s16.html.

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