I know this is slightly left of topic, but I’m a bas-relief sculptor, working mostly for coins.
Once, I had to sculpt a stealth fighter for a coin series about planes.
Bas relief relies on light and shadow to create the illusion of form where there isn’t any.
Modeling the stealth fighter was almost impossible because the angles didn’t bounce light and shadow at all. The whole thing looked flat, no matter how deeply I sculpted it.
It was the same principle as being invisible to radar, just in a visible light spectrum.
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