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Rotating Lines around an Axis or a Circle
Rotating Lines around an Axis or a Circle
Parallel line segments intersect an axis at right angles. They rotate at a rate proportional to the signed distance from the center point of the axis, creating a helicoid.
Collinear line segments intersect a circle at right angles. They rotate at a rate proportional to the distance from one point on the circle, creating a Möbius strip at the halfway mark and a doubly folded strip at time 1.