Look at this picture.

Now, quickly decide: Is it a bunny or a duck?Trick question. It’s both, and if you’re able to quickly see both animals, there’s a good chance that you’re a creative person. At least, that was the conclusion of Ludwig Wittgenstein, the Austrian-British philosopher who created this illusion.

Of course, it’s not the only illusion like this.

You’ve probably seen plenty of pictures that can be two things. They’re all similar, and according to Wittgenstein, they can provide important insight into the ways we think and reason.Wittgenstein did a study in which he presented children with this picture and asked them to identify the animal. He would then show the children a household object and ask them to think of uses for it. In Wittgenstein’s experiment, children who could see both animals could easily think of multiple uses for the object. Children who only saw one animal were more limited.That’s not exactly hard science, of course, and various factors could have affected the results. Some scientists have suggested that emotional and mental states could affect whether or not you’re able to see both images and flip between them easily.Still, the rabbit/duck drawing has maintained its popularity for well over a century. This type of optical illusion is incredibly fun (and frustrating if you can only see one image). Whichever animal you saw first, realize that you’re right. But with that said, it’s totally a duck. Right?