Even the dusti­est mate­r­ial can form the start of an inter­est­ing struc­ture. The lat­tice in funnelweb is con­structed by draw­ing the short­est con­nec­tions between a col­lec­tion of ran­dom lines, and then by tak­ing the clos­est con­nec­tions of the con­nec­tions, and so on, and so on ad infini­tum. (Well, it’s only ten times but by then every­thing has become too tiny to make a dif­fer­ence.) As a fin­ish­ing touch, add a sprin­kling of par­ti­cles mov­ing along the lines. Click the piece to restart.

Since it’s no use rein­vent­ing the wheel, I’m using Toxi's geometry library for manip­u­lat­ing 3D vec­tors. I also tend to con­sult Paul Bourke a lot when play­ing around with geometry.