You can play with lights and shadows
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I'm thinking about how this might turn out in 2D/flat without it just turning into a squiggly circle. Any ideas?
Thinking about it... Wouldn't that make it pseudo-3D? I'm thinking more what Apple did with/to the Siri logo... What do you have in mind?
I’m not familiar with how you do a sketch/toon look in Blender but in Cinema….