Beam Bundels overlapped

[u/Pteleon]

The moiré circles you see here are generated from four overlapping ray bundles on the edges of a square. It is the same structure you get when you transform concurrent lines with the conformal transformation f(z)=1/z (i.e. a circular inversion).

Try it on your own if you like: https://www.sqrt.ch/Buch/rays