Abstract
Human-scale walkable structures have been designed, based on fractal curves, spirals, and knots. Traversing such
structures in one’s imagination is entertaining and can provide a deeper understanding of mathematical objects. If
some of these structures were built, for example in a public park, they would help people to better understand and
appreciate mathematics. They could also find application in video games. Small models of several of them have
been 3D printed.
