# Tessellations by Recognizable Figures

Horseman. M.C. Escher, 1946.

Relevant examples from Escher's work:

When you go looking for something specific, your chances of finding it are very bad. Because of all the things in the world, you're only looking for one of them. When you go looking for anything at all, your chances of finding it are very good. Because of all the things in the world, you're sure to find some of them. - Daryl Zero, The Zero Effect

## Escher's Polygon Systems

Escher's classified his tessellations based on the type of polygon used combined with the symmetries present in the tessellation. Escher used the following polygons:

• A - Parallelogram
• B - Rhombus
• C - Rectangle
• D - Square
• E - Isoceles Right Triangle

Escher used ten different systems of symmetry:

• I - Translation in both transversal and diagonal directions; (no rotations and no glide-reflections)
• II - Translations in one transversal direction; 2-fold rotations on the vertices; 2-fold rotations on the centers of the parallel sides. (no glide-reflections)
• III - Translations in both diagonal directions; 2-fold rotations on the centers of all sides.(no glide-reflections)
• IV - Translations in both diagonal directions; (no rotations); Glide-reflections in both transversal directions.
• V - Translations in one transversal direction; (no rotations); Glide-reflections in one transversal direction. Glide-reflections in both diagonal directions.
• VI - Translations in one diagonal direction; 2-fold rotations on the centers of two adjacent sides.; Glide-reflections in one diagonal direction. Glide-reflections in both transversal directions, but only in the direction of the sides without rotation point.
• VII - No translations; 2-fold rotations on the centers of the parallel sides; Glide-reflections in one transversal direction. Glide-reflections in both diagonal directions.
• VIII - No translations; 2-fold rotations on the four vertices; Glide-reflections in both transversal directions.
• IX - No translations; 4-fold rotations on diagonal vertices; 2-fold rotations on diagonal vertices; No glide-reflections
• X - 4-fold rotations on three vertices; 2-fold rotations on the center of the hypothenuse; No glide-reflections

Escher's Type I.

Escher's Type IV

Escher's Type II

## Other Interesting Methods

Cutting into two tiles. Pentagon tessellation. Escher's favorite Alhambra pattern.