This tessellation was done using the Pg symmetry system. Two parallel glide reflections with a few lines snaking from one to the other. In the sketch below, the thicker lines delineate the two characters, the guy and the dog. Not that many lines. The thinner lines add details to the shape. If you want to know an easy way to create this type of nested shape, have a look under the Techniques menu, and choose the symmetry group you would like to use.
An idea, a few lines, some tweaking, the sketch set aside for a while, pulled out again, re-tweaked, and set aside again. Then a few breakthroughs, insights really, to the path in solving the compromises. An extended journey in seeing both sides of the coin. Tedious but rewarding. Perseverance required. Perspiration obvious. One thing at a time, one day at a time, one problem resolved at a time.
Five years now, that I found the KaleidoPaint app on the iPad. Thanks Jeff! Been having a blast. Over 250 nested shape tessellations and many still in progress.
What it boils down to is one percent inspiration and ninety-nine percent perspiration.
A statement in a press conference (1929), as quoted in Uncommon Friends: Life with Thomas Edison, et. al.