17 Wallpaper Groups
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KEY

	180 degree pivot
	120 degree pivot
	90 degree pivot
	60 degree pivot
	Underlying grid
	Reflection axis
	Glide Reflection axis

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p1 Orbifold: o Grid Translation along1st axis Translation along 2nd axis Translations llustrated because this has only translational symmetry	p2 Orbifold: 2222 Grid and pivot points corners side centers face centers

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p3 Orbifold: 333 Grid and pivot points 1st set of corners 2nd set of corners face centers	p4 Orbifold: 442 Grid and pivot points   corners side centers face centers	p6 Orbifold: 632 Grid and pivot points corners side centers face centers

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pm Orbifold: ** Grid & reflections 1st reflection 2nd reflection	pg Orbifold: xx Grid & reflections 1st glide reflection 2nd glide reflection	cm Orbifold: x* Grid  Reflection Glide Reflection Reflection	pmm Orbifold: *2222 Grid Ref 1    Ref 2 Ref 3    Ref4 1st set corners 2nd set corners 1st Face Center 2nd Face Center	pgg Orbifold: 22x Grid Horizontal Glide Reflection Vertical Glide Reflection Side Center   Face Center

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pmg Orbifold: 22* Grid Reflection 1st Glide Reflection 2nd Glide Reflection Side Point	cmm Orbifold: 2*22 Grid 1st Reflection 2nd Reflection 1st Glide Reflection 2nd Glide Reflection Face Center Side Point	p4m Orbifold: *442 Grid Face Side Corner 1st Reflection 2nd Reflection 3rd Reflection 4th Reflection	p4g Orbifold: 4*2 Grid Corner Corner 1st Reflection 2nd Reflection 1st Glide Reflection 2nd Glide Reflection

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p3m1 Orbifold: *333 Grid Corner Face Face 1st Reflection 2nd Reflection 3rd Reflection 1st Glide Reflection 2nd Glide Reflection 3rd Glide Reflection	p31m Orbifold: 3*3 Grid Corner Corner 1st Reflection 2nd Reflection 3rd Reflection	p6m Orbifold: *632 Grid Corner Face Side 1st Reflection  2nd Reflection 3rd Reflection  4th Reflection 5th Reflection  6th Reflection 1st Glide Ref  2nd Glide Ref 3rd glide Ref  4th Glide Ref 5th Glide Ref  6th Glide Ref

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This table is based on G. Polya's illustration of the 17 plane symmetry groups
as pictured on page 23 of Doris Schattschneider's
M. C. Escher - Visions of Symmetry
published by W. H. Freeman & Company.
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My Tessellation Coloring Book
A Hop David coloring book of Escher like tessellations.
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My Geometrical Designs Coloring Book
A Hop David coloring book of various geometrical landscapes.
A lot of pages are devoted to space filling polyhedra with an emphasis on octahedra alternating with tetrahedra.
There's also some polyhedra studies, logarithmic spirals, fractals (only the first few iterations or they'd be impossible to color!) and some miscellaneous.
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Hop's Escher like tessellations.
Hop's page of Islamic tiles.
Hop's gallery of paintings & drawings.
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Other pages on the 17 wallpaper groups:
Xah Lee
David Joyce
Andrew Crompton
Japanese Designs