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. We've included explanations for many of the images, so scroll down slowly if you don't want to spoil the illusion. 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.