[mensetmanusman]

Reminds me of moiré patterns.

https://en.m.wikipedia.org/wiki/Moiré_pattern

This is found in magic angle graphene, which will likely yield a Nobel Prize in a few years: https://www.quantamagazine.org/when-magic-is-seen-in-twisted...

I wonder if there is a connection to these spirals and their segmentation lengths…

[acjohnson55]

Yep, I think the effect is basically caused by aliasing, much like the moiré effect. Very cool!

[egypturnash]

No aliasing is required. I was first introduced to moire patterns by a book with a bunch of line patterns, and a sheet of transparent plastic with other line patterns printed on it. Put the latter over the former, move it around, watch the weird effects.

[barrkel]

Moire patterns are related to aliasing: the gap between the lines on the overlay is your sample frequency, the lines on the underlying page is your signal frequency, with the angle of the two sheets modifying the relative frequency and the offset of the sheets changing the phase.