experiments with PShapes, beginContour(), quadraticVertex() textures, offScreenBuffers, nested graphics layers, feedback loops, etc.

From Rune's book:
While we can draw most shapes with vertex(), quadraticVertex(), and bezierVertex(), these functions won't allow us to create shapes with holes. In P5.js, a hole is called a contour, and you can draw shapes with contours using the beginContour() and endContour() functions. In essence, the beginContour() function instructs P5 that you are starting a new shape that will be subtracted from your main shape. Like beginShape(), you use the vertex functions to draw your contour, and use endContour() to end the contour.

• Shiffman - Custom Shapes - p5.js Tutorial
• Rune's Programming Design Systems
  • Code examples for Rune's book on Github
• Centripetal Catmull–Rom spline
• A Brief History of Graphics
• Making efficient Platonic and Archimedean Shapes in a Kaleidoscope - vid by 'Stand-Up Maths'
• Deltoidal Kaleidoscopes - Nadal (2022) Bridges Conference
• Josep Rey Nadal, listing from the Bridges Conf

• The Superformula - function to create vertices for shapes
• Create Early Comp Graphics

• Github - creatingSymmetries
• Further Hyperbolic Kaleidoscopes
• Geometry of Kaleidoscopes with Periodic Images
• Variations on the Hyperbolic Kaleidoscope
• Elliptic Kaleidoscopes
• Combinations of Mirror Symmetries
• How to Program Fast Kaleidoscopes
• A Hyperbolic Kaleidoscope
• Apollonian gasket as a spherical fractal with tetrahedral symmetry
• Regular polygons as kaleidoscopes