A 3D View Trinut, made using modified 3D anaglyph code by Paul Bourke and Daniel van Vugt. Best seen with 3D glasses.
A torus is outlined by a quasiperiodic flow on it. This flow is on the ''image'' torus. The flow is lifted to double and triple covers using a rotational symmetry axis as outlined in Phys. Rev. E63, 016206 (2001). The lifted flow outlines a strange geometrical structure that we playfully call a 'donut' or a 'trinut'. The geometrical structure changes as the rotation axis ''slices'' through the original quasiperiodic flow on the image torus. The simulations show how the covering flow changes as the rotation axis moves from outside to inside the image torus.
-Animation by Robert Gilmore and Timothy Jones