A separate page of simple tubular knots is here.
A badly edited version of the image marked † appeared in What Are You Looking At?, Carlton, 2005, and Fantastic Optical Illusions, Carlton, 2006. This pattern shows effects of the Hermann Grid.
Creating an inner polyhedron from the polygonal mid-points leads to an infinite zoom alternating between pairs: Cube/Octahedron, Dodecahedron/Icosahedron, Tetrahedron/Tetrahedron.
An object formed from the perpendicular intersection of three coloured cylinders : seen in X, Y, Z, three angular views, and two animations.
A rhombic dodechedron (rather than the familiar type made from regular pentagons) : seen in X, Y, Z, three angular views, and two animations.
Any single ring can pass through the loop of any other, as a pair, but all three remain as a knot : seen in X, Y, Z, and one angular view.
The rectangular version interlocks in such a way as to resemble a Chinese wooden puzzle, though in this case there is no solution.