OPTICAL illusion fans have been left baffled by this tricky puzzle, and no one can agree what the right answer is.
So do you think you can work it out?
The image was shared on by Crazy Illusions on Twitter, and it's left people scratching their heads.
The account often shares challenging brain teasers, but this one has left people the most confused.
In the image, one person says there are three, but the other is convinced there are four.
In between there are the blocks laying on the floor – so are there three or for?
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One person wrote: "I've been looking at this for 30 mins now, and I still only see three blocks. Am I doing something wrong?"
A second said: "If you look hard enough it's definitely 3, great optical illusion."
"There are 4 – if you see 3 there is something wrong with you," a third slammed.
However, some people thought they could see both three and four, which confused them even more.
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"4, twice I've seen 3, but mostly 4," one wrote.
Another agreed: "Sometimes I see 4, sometimes 3. Depends on the angle I suppose."
But others could still online see one or the other: "I don't understand how anyone can see 3 lol."
The bad news is there's no real right answer to the brain teaser, so you'll have to decide for yourself how many blocks there are.
Why not show your friends to see how many they see too?
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