India, Aug. 28 -- Optical illusions have long captured the curiosity of internet users, and every now and then a new puzzle appears online that leaves people scratching their heads. The latest challenge has surfaced on Reddit, where users were presented with a seemingly ordinary picture of a tree. At first glance it looks like nothing more than the base of a large tree, yet hidden within is a lizard that blends almost perfectly into its surroundings.

(Also read: Optical Illusion: How many lizards can you spot in 30 seconds? Only 1 in 20 people find all hidden ones)

The picture captures the base of a tree with weathered bark, exposed roots, and patches of white lichen. The trunk appears aged and slightly decayed, showing years of natural...