I like the suggestion that maybe I'm only looking at the inner 7, but shouldn't
I be able to find an out-of-focus that also reveals the 19 and 37? I can see the
square at blur_samples 4, for example.

Out of focus is the idea: in my original code I'm looking at a parabolic mirror
with a secondary mirror obstruction, and I get the rings (donuts) you'd see in a
real reflecting telescope that is out of focus. But as I de-focus, the ring
separates into 6 blobs, not 19, and not 37, no matter how I set blur_samples,
focal point, distance, and size of my sphere.

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