Brownian surface is a type of surface that is made up of very tiny particles called atoms or molecules. These particles move around very quickly, bumping into each other and bouncing off each other. They form an ever-changing pattern of motion on the surface called Brownian motion, which is named after the scientist Robert Brown who first studied it. Brownian motion is random and unpredictable, so the patterns it creates are always changing. This makes Brownian surfaces very interesting and unique!