OK, you want to try it? Watch this video before you read any further. Got it? Good. Let’s see how smart you (maybe) are.
In a study run by researchers at the University at Rochester, researchers had subjects watch that same video you just did. They also had them take a standard IQ test. What they found was that people who had an easier time seeing movement in the smaller bars as opposed to the larger ones had—drum roll please—higher IQs. Generally.