New Delhi, Aug. 8 -- Optical illusions are going viral these days. One particular challenge has left people squinting at their screens, trying to figure out what this chaotic, speckled carpet is hiding. An image going viral on Reddit this week has thousands of users spiraling into visual frustration, all thanks to a surprisingly well-camouflaged spider. The post was shared on the subreddit r/FindTheSniper. At first glance, this one looks like an old carpet - a mess of tiny multicolored threads and pixel-like noise. But somewhere in this static mess, there is a spider.

"Thought this was one of those magic eye things that if I stare at it long enough I'll see it," one Redditor commented, summing up the experience of just about everyone who...