A loose confederation of doodly gaskets and aspiring sierpinski triangles (distorted by their round rooms, of course).
>> WARNING: MATH PUN AHEAD — READER DISCRETION ADVISED <<
On second thought, those darn things probably don’t quite qualify as official “Sierpinski Triangles”… but at the very least, we might call them “Circle-Pinch-ski TRY-angles.”
www.MarekBennett.com 
I will stick with a spirograph.
That’s a good tool, too!
I just prefer hand-drawn doodles because they’re imperfect.
Like humans.