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Another day, another viral puzzle that has you wondering if it's your brain or eyeballs that are broken. The Dress famously shattered the illusions of objective reality, and subsequent puzzles have made people on the Internet actually focus (even if it's just for a few seconds). The latest challenge involves a big red dot, but isn't just simply a close up of the Japanese flag. Can you see what's inside the circle?

 

According to the crazy little thing called science, this test measures contrast sensitivity—whether you can see the difference between the different shades of red. Dr. Michelle Akler told Self magazine that this red dot is also a test that shows how persistence pays off. According to Self: