Harold V. Mcintosh
REC-F is one of a series of specialized REC programs; in this case one which provides assistance in designing flexagons. Flexagons were popularized by Martin Gardner in Scientific American in the early 1960's. It is still possible to read his descriptions inasmuch as the original articles have since been reprinted in various collections of his articles. Basically, a flexagon is a fractal derived from a stack of polygons which can be folded back and forth, preferably coming to rest in a plane; so they resemble dragon curves and Lindenmayer L-systems. The purpose of REC-F is to draw the frieze of polygons which will eventually be folded up to make a given flexagon.
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