An optical illusion has stunned social media users, but many viewers report not seeing a change at all.
The video, created by the TikTok channel @hecticnick, has captured over 682,000 views.
It features an image of a black dot on a blue Egyptian pyramid set over an orange background.
After focussing on the black dot, it's said the image will turn black and white after you blink.
However, viewers said they were simply unable to see the illusion full stop in many of the 1,411 comments.
In a voice over, Nick says: "Focus on the black dot in the middle of this pyramid! After a little bit I'm gonna show you the same image but in black and white."
"Although to you it's going to appear to be in full colour, so watch this!," he continues.
"It looks to be in colour, right? Well, watch what happens when you blink. It will suddenly appear to be black and white."
The most popular comment on the video, which was liked 640 times, said: "Am I the only one who saw black and white even when I stared at the dot?"
One person said it didn't work despite trying about 26 times.
Another cut to the chase, commenting: "Did not work."
Some said they did see the difference, but claimed it had been manipulated.
"If you watch it enough you can slowly see the colour run out from the screen where the dot was," wrote one user.
A second person added: "He just made it black and white."
Another recent optical illusion online includes one in which numbers are hidden in a spiral with people reporting seeing different digits.
So, did the pyramid change colour in your eyes? If so, do you think it was manipulated?
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