Truchet tiles

In information visualization and graphic design, Truchet tiles are square tiles decorated with patterns that are not rotationally symmetric. When placed within a square tiling of the plane, they can form varied patterns, and the orientation of each tile can be used to visualize information associated with the tile's position within the tiling.

Truchet tiles were first described in a 1704 memoir by Sébastien Truchet entitled "Memoir sur les Combinaisons", and were popularized in 1987 by Cyril Stanley Smith.

Variations

Contrasting triangles

The tiles originally studied by Truchet use a pattern in which each tile is split into two triangles of contrasting colors. Each such tile has four possible orientations.

Some examples of surface filling made tiling such a pattern.

With a scheme:

With random placement:

Quarter-circles

A second common form of the Truchet tiles, due to Smith (1987), decorates each tile with two quarter-circles connecting the midpoints of adjacent sides. Each such tile has two possible orientations.

The Truchet tile

Inverse of the Truchet tile, created by any 90° rotation or orthogonal flip

We have such a tiling:

This type of tile has also been used in abstract strategy games Trax and the Black Path Game, prior to Smith's work.

Diagonal

A labyrinth can be generated by tiles in the form of a white square with a black diagonal. As with the quarter-circle tiles, each such tile has two orientations. Nick Montfort considers the single line of computer code required to generate such patterns - 10 PRINT CHR$(205.5+RND(1)); : GOTO 10 - to be "a concrete poem, a found poem".

A labyrinth generated from diagonal tiles

See also

• Girih tiles
• Wallpaper group
• Wang tiles

External links

• Weisstein, Eric W., "Truchet Tiling", MathWorld.
• Truchet in 2D and 3D: http://local.wasp.uwa.edu.au/~pbourke/texture_colour/periodic/
• Javascript animation: http://perso.orange.fr/jean-paul.davalan/divers/truchet/truc.html