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I’d think most animals would have developed the ability to see that illusion because it’s not based on seeing squares but on identifying something that is partially occluded, or at least identifying that it is all part of the same thing. If some grass or branches between you and another animal means you can’t see that there’s an animal behind it, you’re going to be at a severe disadvantage whether you’re trying to eat that animal or it’s trying to eat you. I’d guess that capability evolved before mammals.
I’d think most animals would have developed the ability to see that illusion because it’s not based on seeing squares but on identifying something that is partially occluded, or at least identifying that it is all part of the same thing. If some grass or branches between you and another animal means you can’t see that there’s an animal behind it, you’re going to be at a severe disadvantage whether you’re trying to eat that animal or it’s trying to eat you. I’d guess that capability evolved before mammals.