Although most of us rely on them a lot, our eyes can be pretty easy to fool sometimes.
Whether it's because we're looking at something from a weird angle, seeing it in weird lighting, or seeing it out of the corner of our eye, there can be quite a disconnect between what we're seeing and what's really there.
It's for that reason that one friend back in school swore up and down that a dictionary we used in French class had the word "honkydoodle" in it. And it's also the reason why we can see something completely different in these photos even after we know what they are.