A viral Reddit illusion showed a bird hidden among pebbles, leaving users baffled as they struggled to spot it.

Gentle manipulation of micrometer-sized dielectric objects with optical forces has found many applications ... is successfully tested on 22 nm polystyrene beads, showing both single- and double-bead ...

Challenge your observation skills with this tricky optical illusion! A hidden diamond awaits discovery amidst a sea of pearls ...