Hilbert Curves https://en.wikipedia.org/wiki/Hilbert_curve are funny and convoluted curves that (on their ideal and final configuration) fill the space. Brains and
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guts and other biological tissues are similar (they tend to maximize surface while using low volume).
Use a 7mm sphere bearing.
A short video showing the ramp at work: https://www.youtube.com/watch?v=HcspDSGJ5UI
This version is the third iteration towards a Hilbert Curve. You can see how each of the 4 quadrants resemble the whole geometry, thus exhibiting fractal behavior.
