YOU have to have 20/20 vision if you can spot the two casts hiding on the bookshelf in under 10 seconds.
If you can spot the cute kittens before the camera zooms in you have the eyes of a hawk.
The optical illusion was shared on TikTok.
Two cute felines are hidden within the bookshelf, and only eager-eyed viewers will be able to see them without a little help.
If you are still baffled, scroll down for a clue.
If you were able to figure it out, try and spot the dog amongst the herd of cows by following this link.
If you need help, try looking at the cows' horns – are there any that don't fit the bill?
Optical illusions are popular on social media.
One TikTok user posted another confusing optical illusion, creating a small viral moment with users trying to spot a hidden animal in the fastest time possible.
Scott Whatley (@scottwhatleyhunting) told his followers: "Believe it or not, there is a small, yearling deer in this video.”
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The hunter said he had shown it to many of his friends, who lied and said they could spot the deer as a matter of ego.
"I've shown it to a couple of different hunters and they all say they see it long before they do, out of pride," he joked.
“They end up seeing it, real hunters will see it, but usually not until the very end," Scott continued.
The clip gained over 22,000 likes and thousands of comments.
"I saw it legit as soon as the video started," one fellow TikToker commented.
"Blends in very well," said another.
"I saw it in three seconds," one person bragged.
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