2 thoughts on “Artichoke ~

  1. Hello, what an interesting question! It is a dome, convex. It has spirals kind of like a sunflower pod, I think the spirals create this optical illusion you speak of.

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  2. I wish I could “read” the last image. Is the brown part concave or convex? I see it as convex, but that doesn’t make sense to me. And concave doesn’t make sense to me either.

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