a circle repeated, recursively, getting smaller and smaller as it moves from the bottom left to the top left corner.
https://pool.jortage.com/tootcat/media_attachments/files/106/971/258/212/523/039/original/5acfb8001b9feb37.png
corner-split a la SICP section 2.2.4 using chickadee's vector path rendering. using a gradient filled circle for simplicity here but it could be any arbitrarily complex vector graphic.
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