This tessellation is built using the Pgg symmetry group. A grid of two different perpendicular glide lines with two different two-way (180*) rotation points in the middle of each rectangle. Sounds like a lot to take into account, when planning the drawing, but it’s not that difficult. If you want tricks on how to accomplish this type of nested shape, check the Pgg symmetry blog post from a while back, I’ve detailed the whole process.
A glide reflection, can be described as a carnival carrousel horse, on its pole, front and back not symmetrical, twist the pole, and the horse faces the other way. Now build a whole stack of horses on the same pole, alternating the direction each horse faces. That is a glide reflection!
This mouse sketch was done a few years ago, and set aside for further work. I pulled it out recently as it had shown potential. Especially having recently written a blog post on bending the rules of symmetry. See if you can spot my cheat!
A little sad looking, needs help.
A few minutes of work to remove the sketch under some prime lines, and then some work tweaking the outline. No fur drawn on this mouse, had enough last week with those two dogs.
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