WAL about rotational symmetry.
Pinwheels
We made pinwheels. When they spin the still have symmetry.
If you make a small pinwheel it spins faster.
A bigger pinwheel got stuck on the handle.
It was too floppy.
If you put a fan in front of the pinwheel it spins faster.
If you use a bead for a spacer the pinwheel won’t
get stuck on the handle.
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