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so, `#-sin(frame * tau/400)` as a driver for the X in the "instance on points" "geo nodes" object (which appears to be controlling the instances) and routing the particle to it causes it to rotate... not quite right...
(in short `2pi radians == 360 degrees` and `2pi = tau` so `frame * tau / max frames` will yield one full rotation. Also I think a `cos` is required here instead of a `sin`...)
What I'm missing, is how is the octagon being animated...?
Anyway, this is really neat!