Get enough dots together and your faulty eyeballs start seeing things. With random dot patterns, a simple move of the dots by a few degrees can create trippy concentric circles or wild swirls that ...

Certain periodic dot patterns (Marroquin patterns) generate a percept of dynamically oscillating circles, and analogous effects were explored by op artists in the 1960s. Here we show psychophysically ...

If you overlay a copy of random dots on itself, and then rotate it, magic — or, rather, a trick of geometry and pattern recognition — happens. As Numberphile’s Tadashi Tokieda (who previously brought ...