If you are a child under the age of 10 who haven't been ruined yet, you will look at this image and see dolphins. Now, some of you adults here are saying, "" What dolphins? What dolphins? "" But in fact, if you reversed the figure ground — in other words, the dark areas here — I forgot to ask for a pointer — but if you reverse it, you'll see a whole series of little dolphins. By the way, if you're also a student at CalTech — they also tend to just see the dolphins. It's based on experience.