Optical illusions are made to baffle the brain.
Recently, many were left confused by an optical illusion which was hiding nine other faces.
And on another occasion, a tricky image showed seven horses in snap, although many can only see five.
So if you fancy something new to keep you busy, here's an image that'll really confuse you.
On the US website Kids Environment Kids Health, an illusion called the Rocky Faces looks tricky at first glance.
The page posed the question: "How many human faces can you find in this picture?"
If you need a clue, just remember there are probably more than you first see, so keep trying.
The illustration shows a human figure on a horse with a second animal beside.
But in the rocky image, it leaves the illusion that a number of faces could be hiding in the picture too.
According to the website, there are a number of answers – so there's no right or wrong.
It said: "Seeing 4 or 5 is average; 6 or 7, above average; 8 or 9, very observant; 10 or 11, extraordinarily observant."
How many can you see in the image? Let us know in the comments below…
Reddit users were left scratching their heads as an optical illusion showed a "curved line".
The user wrote: "Thanks, I hate optical illusions," in the image which said: "Go ahead, find the curved line."
In the picture, it shows green lines to form a grid on a grey background.
At the time, the post racked up over 4,400 upvotes and hundreds of comments.
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