See the optical illusion that makes colours disappear if you look long enough

It's been years since the photo of that white and gold dress (or is it blue and black?) split internet users 50-50, causing fierce debate throughout the world about its true colours.

The internet has continued to love a good optical illusion in the time since, with countless revisions of the original post being shared across the web.

While many of those weren't that impressive, there are still a few floating around that are genuinely mind-blowing - and the below is one of those.

Apparently, if you stare hard enough at one point on this image, all the colours disappear. That's right - it will go completely blank.

While the image has just gone viral thanks to it being posted on social media site Reddit, the optical illusion has actually been around for a long time.

This particular one was founded by Swiss doctor Ignaz Paul Vital Troxler in 1804, and is known as Troxler's fading.