It’s nothing new, but the classic brain-bending illusion has been making its way around the web.
Is it a duck or is it a rabbit?
The illustration is supposed to point out that what you see is not completely based on what is being looked at, but is party due to what’s happening in your brain, according to Wolfram MathWorld.
Researchers say the easier it is for you to flip between seeing a rabbit or a duck, the more creative you are, according to a report by Mirror.
The image first made an appearance in the late 1800s, but that doesn’t mean modern-day psychologists, or Twitter-users, can’t enjoy it.