- Shadertoy: https://www.shadertoy.com/
- Inigo Quilez website: https://iquilezles.org/articles/
- 2D signed distance functions: https://iquilezles.org/articles/distfunctions2d/
- Color palette article: https://iquilezles.org/articles/palettes/
- Color palette webapp: http://dev.thi.ng/gradients/
- Graphtoy: https://graphtoy.com/