Although not readily apparent from the code, this piece is a precursor of curvature. Both constructs keep track of drawn curves by filling an invisible grid. When the tracing particles hit an already filled space, the curve is stopped and reincarnated. This mechanism is obfuscated in haywire by the artificial depth offset. But if all curves would be drawn on the same plane, the resulting image would resemble those generated by curvature.

The ultimate example of this drawing mechanism is Jared Tarbell’s masterpiece ‘substrate’. Some of the fine pieces by Dave Bollinger also seem to use something like it.

Click on the image to go to the corresponding construct. A click of the mouse resets the piece. On some platforms the lines are not properly anti-aliased. I haven’t figured out why but it sure messes up the images.