11428

Ammann Tiling A4

This Demonstration shows a parametrized version of the aperiodic tiling A4 discovered by Robert Ammann in 1977 [1]. The method uses substitution tiling.

SNAPSHOTS

  • [Snapshot]
  • [Snapshot]
  • [Snapshot]

DETAILS

In 1977, Robert Ammann [1] discovered a set of aperiodic prototiles later called the set A4 by Grünbaum and Shephard [2]. In order to ensure an aperiodic tiling, the original tiling uses either marked tiles or tiles with indentations that must be filled by keys. This Demonstration does not need keys because the substitution rules force aperiodicity. The parameters and can have any positive value (limited to the range in this Demonstration), but only for do the Amman bars become straight lines. With increasing iteration levels, the super tiles approach the same shape as obtained directly by setting the parameter ratio to , that is, when using this ratio, subsequent super tile shapes are similar.
Controls
"iteration"
The initial tile (prototile) is shown at iteration level 0; higher levels show iterated super tiles composed of prototiles.
"tile level"
Tiles are colored according to the given level as long as it is at most the current iteration level.
"colors"
Set the coloring of the involved prototile types.
", "
The bottom slider controls and the upper slider controls . Changing the sliders has no visual impact when is fixed to .
"prototile"
Select one of the three involved prototile types as the initial tile.
"bars"
Use this checkbox to toggle the display of Amman bars; straight lines across the tiling only appear if .
""
Select whether the value of is forced to or set by the , slider. The current slider settings are unchanged.
"edges"
Use this popup menu to select the color of the prototile edges.
References
[1] Wikipedia. "Robert Ammann." (July 27, 2017) en.wikipedia.org/wiki/Robert_Ammann.
[2] B. Grünbaum and G. C. Shephard, Tilings and Patterns, New York: W. H. Freeman, 1987 pp. 529–530.
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.









 
RELATED RESOURCES
Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-Step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2017 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+