Do you see a number? What do you see?
An optical illusion has taken over the internet, sparking fierce debate about what you should really be seeing.
On Thursday, a Twitter user posted the image on the social media platform and since then thousands of people have weighed in.
Their answers vary wildly.
"45 283 … and what's the catch? Should I book an appointment with my GP?" commented one person.
"I can only see 528. Does that mean anything about my eyesight?" added another.
Former English Olympic swimming champion Sharron Davies was among those who replied to the original tweet. She saw 15283 in the image.
Other answers rolled in including 3452839 and 845283.
At time of writing, there were more than 7000 responses to the tweet and no clear consensus.
The correct answer seems to be 3452839, which is more apparent when you increase the contrast on the image.
Twitter users also recommended lying your phone screen flat for a clearer view of the numbers.
The University of Queensland's special Queensland Brain Institute branch had a simple explanation for vastly different responses when it came to optical illusions.
"Sometimes, our brain gets confused by what the eyes are trying to tell it," the institute wrote in a blog post.
"Our eyes and brain speak to each other in a very simple language, like a child who doesn't know many words. Most of the time that's not a problem and our brain is able to understand what the eyes tell it …
"Sometimes, however, the brain guesses wrong.
Optical illusions happen when our brain and eyes try to speak to each other in simple language but the interpretation gets a bit mixed up ...
"A lot of scientists have worked very hard for many years trying to understand how optical illusions work. But the truth is, in many cases, we still don't know for sure exactly how our brain and eyes work together to create these illusions."
The image is reminiscent of "the dress", a viral internet phenomenon in 2015 that saw people largely divided over whether the dress was black and blue or white and gold.
Caitlin McNeill, a Scottish singer, originally posted the picture on Tumblr after her friend saw different colours in the photo and it prompted a viral media storm.
A woman named Cecilia Bleasdale had picked up the garment from Roman Originals for a wedding and sent a picture of the dress to her daughter Grace.
Later, Grace, who was the one getting married, posted the picture on Facebook where debate exploded.
But that debate had pretty much been forgotten until Caitlin then posted the picture on Tumblr. Caitlin's band had performed at Grace's wedding.
The argument over the dress then went global.
It turned out the dress was in actuality black and blue — although poor exposure and bad white balance made it appear white and gold to many.
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