The post shows a bunch of blurry pastel hues blending together. At first glance, the picture does not seem particularly optical illusion-worthy. But Reddit user NightBreeze13 posted the picture with very clear instructions to offer: "This picture will fade away if you stare at it (may take a minute)."
Keep still and focus your gaze on one point of the picture below. Try not to strain your eyes but stare into it without blinking.
Slowly, the colours around the point of focus should fade to white.
Try it for yourself!
The moment you blink or look away, the colours will re-emerge.
Amazing, isn't it?
According to the Illusions Index, an online database from the University of Glasgow's Center for the Study of Perceptual Experience, the freaky phenomenon is due to something called the Troxler effect.
The mind-bending phenomenon is named after Swiss physician and philosopher Ignaz Paul Vital Troxler who discovered that "rigidly fixating one's gaze on some element in the visual field can cause surrounding stationary images to seem to slowly disappear or fade."
Wondering why the image appears white? That's because our brains replace - or fill in - the image depending on what background it's on.
Looking for another brain-teaser? Click here to spot the differences between two images. Or click here to calculate the number of triangles in this picture. Click for more trending news