I've seen (geometric feature) in pictures of Lyapunov-Markus fractals, quaternion Julia sets: they look like flattened blancmanges, if you try to render them in some lighting models, they look metallic, or like obsidian.
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I've seen (geometric feature) in pictures of Lyapunov-Markus fractals, quaternion Julia sets: they look like flattened blancmanges, if you try to render them in some lighting models, they look metallic, or like obsidian.