Recent Additions to the Junkyard
These files and pointers have been added to the junkyard or modified since 2011.
Dérivés de l'hexagone. Art by Jerome Pierre based on modifications to the edges in a hexagonal tiling of the plane.
Fractal knots, Robert Fathauer.
Frustro, a font made of Escherian impossible figures.
Gavrog, a Java package for visualizing 2d and 3d ornamental patterns with high degrees of symmetry.
MagicTile. Klein's quartic meets the Rubik's cube, by Roice Nelson.
Origami proof of the Pythagorean theorem, Vi Hart.
Seven circle theorem, an applet illustrating the fact that if six circles are tangent to and completely surrounding a seventh circle, then connecting opposite points of tangency in pairs forms three lines that meet in a single point, by Michael Borcherds. Other applets by Borcherds include Poncelet's porism, a similar porism with an ellipse and a parabola and with two ellipses, and more generally with two conics of variable type.
Tetrahedra packing. Mathematica implementation of the Chen-Engel-Glotzer packing of space by regular tetrahedra, the densest known such packing to date.
Wooden ball-and-stick models of Archimedean solids, offered for sale by Dr. B's Science Basics.