In the past two years, the internet has given us The Dress, a photo of a mysterious missing leg, and this disorienting floor design.
If you're still hungry for more, INSIDER rounded up a mix of classic optical illusions, baffling viral photos, and mind-boggling designs that'll leave your head spinning and illustrate how our brains process and interpret color, peripheral vision, size, and more.
One quick note: We've included explanations for many of the images, so scroll down slowly if you don't want to spoil the illusion.
The amorphous shape at the bottom of this painting has confused people for centuries.
Titled "The Ambassadors," this painting was finished in 1533 by German artist Hans Holbein the Younger. It's currently on display at the National Museum in London, UK.
When you look at the painting head-on, you'll see what appears to be a large, deformed object at the bottom. But when viewed from a particular angle, the blob turns into a human skull before your eyes.
According to researcher Phillip Kent, this painting is one of the most famous examples of an anamorphosis — an irregularly shaped image that appears in its "true" form when viewed in an "unconventional" way — in art.
What color are the circles in this photo?
This colorful image went viral in mid-July after its creator, University of Texas professor, Dr. David Novick, shared it on Twitter.
Despite what you may see, it turns out all the circles are actually the same color. "The differences are subtle, though, and depend on the size of the image when it's viewed," Dr. Novick tweeted.
Dr. Novick's image, which he calls "Confetti," is an example of a classic optical illusion known as a Munker illusion. According to Danish professor Michael Bach, the Munker illusion reveals how much our perception of color is influenced by other surrounding colors.
At first glance, this photo seems to depict a man leaning over and embracing a woman who is sitting at her desk.
In May, a Twitter user named CJ Fentroy posted a picture of what appears to be two coworkers laughing and hugging. It also looks like the guy in the photo is rocking a light blue shirt, white skinny jeans, and black heels while the woman is wearing a plaid shirt in shades of magenta.
It's a cute but otherwise uneventful photo that you might just scroll past online if it weren't for Fentroy's caption. "At first, I thought he was wearing the heels," the Twitter user wrote.
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