India, Sept. 1 -- Optical illusion challenges are gaining popularity on the internet, and Reddit's r/FindTheSniper community has emerged as one of the most sought-after forums for fellow enthusiasts to challenge one another. Recently, a post by user Glitterrtits has gone viral. The image hides a small black clip, a keychain carabiner, on a grated metal floor. This puzzle is testing both the observational skills and the patience of netizens.

At first glance, the photo seems normal. It shows a pair of legs wearing light-colored pants and dark shoes standing on a metal floor. The floor has diamond-shaped holes in a repeating pattern. But if you look carefully, you will see a tiny black clip hidden among the metal grating. Most people miss i...