Jörg>Telepathy? If have been thinking about _exactly_ this for some time, but did not code it up because my home-grown software does not really make it easy... Extra points if you do that gif-ery for the curve http://jjj.de/tmp-ryde/t-shirt-R13-15-hires-cropped.png (L-system at bottom, turns are by 120 degrees). Total curve should be light gray, and the moving part should be 1/13 of the total (so the same shape will appear 13 times, as indicated in the image). ... plus you get a T-shirt! (If you use the image to, well, print one. I got one and it looks quite OK). Best, jj Holy cr@p, http://gosper.org/semizerp.htm and http://gosper.org/semizerp1.htm on steroids! Another 13fold recursion, replete with inhomogeneous scaling: Mandelbrot's recursive Snowflake. Can such be likewise "teardropped"? He also had a 7fold recursion, I think. --rwg * Bill Gosper <billgosper@gmail.com> [Aug 31. 2014 11:27]: The Dragon *function* (not curve, dammit) continuously mapping [0,1] into the box[-1/3-i/3, 7/6+2i/3] with the image of a circulating interval of length 1/10 highlighted, pausing at various multiples of 1/10 to show anatomical measurements. gosper.org/dragondrift.gif --rwg