Spending a ton of time trying to figure out an optical illusion is pretty common for most of us. But while they can be pretty tough to crack, they’re also the perfect way to boost your brain power!
Click through the gallery to see optical illusions that will definitely make you do a double-take.

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Optical Illusion 5
Which one's sitting in the chair, and which one's standing up?
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Optical Illusion 1
Is this man really that huge?
Well, he might look like a giant, but he only looks so big because he's a lot closer to the camera.
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Optical Illusion 6
Believe it or not, this man actually doesn't have a super long beard. Look again.
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Oily Legs Illusion Trick
Do you see legs covered in a shiny oil? Sorry to ruin this for you forever: It's actually just a few streaks of white chalk paint. And now that we told you the truth, you'll NEVER be able to see the shine again. Right?!
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Optical Illusion 12
Is that really a child with a man's head? Look a little closer.
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Optical Illusion 17
Which way is this man facing? Forward, or sideways?
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Optical Illusion 8
It might look like the tower on the right is leaning, but if you look a little closer you'll notice that it's actually the exact same picture.
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Optical Illusion 13
Can you count how many girls are in this photo?
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Optical Illusion 11
Is the guy carrying the girl, or is the girl actually carrying the guy?
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Optical Illusion 3
Is this lady giving that man in the blue shirt a piggy-back ride?
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Optical Illusion 10
Whose legs are in front, and whose legs are behind?
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Optical Illusion 14
Is he really balancing on those two bottles?
(It can be a little hard to see, but he's actually standing farther in the background while the bottles are moved up closer to create the illusion.)
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Optical Illusion 2
Is this cat walking up the stairs, or down the stairs?
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Optical Illusion 7
Is this an escalator that's going up, or down?
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Optical Illusion 15
It might look like all the ends to this dice triangle are connected, but really, there are two ends that aren't touching at all. While the two left sides are lying flat, the right side is stacked vertically, so it's just a matter of how the dice are angled.
If you're still feeling stumped, check out this video to see how it's made.