whatAn orb web built in the true order every spider follows: bridge and frame, then radii laid alternately to balance the pull, then a wide auxiliary spiral walked outward as scaffolding -- and then the sticky spiral, laid inward, EATING the scaffold as it goes. What you see at dawn is the residue of a procedure. Sped up here; the real builder takes most of an hour.

whyThen the claim: the finished web is an instrument. Click to throw prey in; it struggles, vibration runs down the threads, and the spider at the hub -- which cannot see -- finds it by TENSION ALONE, reading the strain rhythms of the radii it holds and running out along the loudest one. The HUD scores every catch against the true direction; radii sit fifteen degrees apart, and she is usually within one.

howThe web is a position-based mass-spring net, pre-tensioned, outer ends pinned to the frame; prey is a displacement rhythm at a junction. The spider accumulates high-passed strain energy per radius at its hub segments and picks the argmax. Construction is a schedule over the same springs, each thread born when laid. One integer seeds anchors, radii, spirals, and prey.