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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.

- Robert Fathauer's Escher-like tesselation art.

- 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.

- Sierpinski Hamantaschen.

- 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.

From the Geometry Junkyard,
computational
and recreational geometry pointers.

Send email if you
know of an appropriate page not listed here.

David Eppstein,
Theory Group,
ICS,
UC Irvine.

Semi-automatically
filtered
from a common source file.