Genuary 17 -- A grid inside a grid inside a grid

This is my creation for Genuary 2023, day 17. Genuary is an artificially generated month of time when we create beautiful things. There are 31 prompts, one for each day. The seventeenth prompt for 2023 was "a grid inside a grid inside a grid". This is my interpretation of that.

It's a GLSL fragment shader, doing stuff with nested grids, rotations and smooth minimums. Rendered using dithered 8x oversampling for extra detail. Don't forget to try it on full screen.

Copyright 2023 by Piter Pasma. https://piterpasma.nl