A head-scratching optical illusion challenges the perception of color and how the brain plays tricks on us. In an image created by the UK contact lens vendor Lenstore, a series of lilac letters ...

Perception researchers have long known about the structural and functional features that differentiate our central vision from our peripheral vision. The central (or foveal) region of our retinas are ...

Optical illusions have a way of tricking our eyes and testing our concentration, often turning a simple picture into a playful challenge. At first glance, the image above looks like nothing more than ...