It's true, we see faces where there aren't any. But we usually know very quickly that it's not a real person- even if we might be confused if we catch it out of

It's true, we see faces where there aren't any. But we usually know very quickly that it's not a real person- even if we might be confused if we catch it out of the corner of our eye, as soon as we get a chance to look at it for more than a split second we will change our mind and not believe it's a real face. Of course there are more persistent failure modes where we can be tricked for a lot longer, and artificial illusions that persist despite knowing what they are.