Wallpaper group pmm

Tonight's Wallpaper group is pmm. The cell structure is rectangular and it features order two rotations and many reflections. Here's the basic cell structure:

Key

	a centre of rotation of order two (180°).
	an axis of reflection.

 Image and Key: Source: Wikipedia

Here's a part of the cell (corresponding to the yellow region of the cell diagram above).

Now reflect it upwards, and then reflect the whole thing to the right to get the full cell:

Now tile!

For more examples of group pmm visit my Pinterest Board.