Some of these patterns remain open, and others close up after a certain number of repetitions. Such exercises in design can serve as idea generators for architects, Krawcyzk suggests. The procedure for generating spirolaterals is simple, but the patterns that arise are amazingly varied. A visitor to the page can set the parameters, then view the result. It's also possible to change the line thickness and add a contrasting center line to each segment of the pattern or contrasting edge lines where thickened lines intersect.
Users can investigate all sorts of variants.
Krawcyzk himself has printed various spirolateral designs on personalized sets of notecards. He's planning to set up a Web-based system so that a visitor could create a design, then purchase a copy, specifying in what format and how it should be delivered to him or her. In Knotted Doughnuts and Other Mathematical Entertainments. Krawczyk, R.J. 2000. The art of spirolateral reversals.