Squid and glider

-

The first of four short articles where I combine two shapes with mirror symmetry to form tilings.

In the first example, I chose one of Bram Cohen's polygons which I have named the squid.  This shape can tile easily (and rather boringly) on its own unless you include hexagonal formations of six squids (in grey) as shown below: 




With this in mind, the squid now behaves differently and relies on another shape which I have named the glider (in white), in order to tile the plane.  The two tiles in combination can produce an attractive periodic pattern which can continue without limits and exhibits a structure that is possibly unique.

The six squids that make up the smaller hexagons can be positioned in a clockwise or anticlockwise direction but everything else remains static:





These drawings were created using the latest stable version of Arnaud Chéritat's applet:
https://www.math.univ-toulouse.fr/~cheritat/AppletsDivers/Monotile/generic/v4.1/

Comments

Post a Comment

Popular posts from this blog

Determining chess 960 starting positions with a standard die (no rethrows)

-
Image
Chess 960 is a chess game variant invented by Bobby Fischer in 1996.   In Chess 960, the pawns are lined up on the second rank as in standard chess.   The first rank pieces are positioned randomly whilst conforming to certain caveats - the king must be placed somewhere between the rooks to allow castling; the bishops must stand on opposite coloured squares. I've worked out a system that allows me to select a starting arrangement for the first rank pieces using a standard six sided die without the need for rethrows.  My dice procedure is different from that of  I ngo Althöfer's (devised in 1998), where rethrows can occur.   Some information on how his system works can be seen here https://www.chessvariants.org/diffsetup.dir/fischer-random-setup.html The die I use to generate the random piece arrangement is a standard cube/hexahedron (one of the platonic solids).  O nly five or six throws of the die are needed to formulate one of the 960 starting positions. Rethrows add to the t
Read more

Fractal chevron

-
Image
I started with a chevron consisting of four equilateral triangles.  Each of those was then subdivided into nine smaller triangles, so that alternating bumps and notches could be applied to the centre of each side on the perimeter (for practical reasons I used a reverse approach, scaling up sides by a factor of three and reducing once done).  In theory, this process can continue indefinitely to produce complex fractal-like outlines.     There are left and right versions of the modified chevron, depending on which face is upward.  This means you cannot use both versions in the same tessellation.  Nine copies of each newly generated tile, can be put together to produce the next iteration.  Applying bumps and notches to even numbered polyiamonds, alters the tiling properties after the first iteration. There are four permutations for the chevron but only two for the modified versions, i.e., first and third from the left. These bumped and notched chevrons can be put together in six different
Read more

Nine kites

-
Image
All permutations of polykites from 1-24 have been exhaustively researched by Joseph Myers.  His computational results almost run into trillions.  For more info, please visit - https://www.polyomino.org.uk/mathematics/polyform-tiling/ I have already covered a few polykites (including the hat and turtle) and have now picked out another that has an interesting property.  This polygon has sixteen sides and I have named it the 'hare'.  It also resembles a bushy tailed squirrel but I already have accounted for two of them - https://hedraweb.wordpress.com/2022/10/14/polydrafter-squirrels/ It tiles periodically with or without reflections Hares can be assembled to make up triangles of unlimited size.  The hexagon on the right is made up of six of the smallest triangles. Smallest hexagon inside a large triangle.   The triangular area above can also be assembled in at least one other way.  I flipped it to suit.   Below is a larger hexagon made up of 'next size up' triangles.  The
Read more