PROF. ARTHUR WINFREE / SCIENCE PHOTO LIBRARY PROF. ARTHUR WINFREE / SCIENCE PHOTO LIBRARY
Two-dimensional waves of chemical change in a shallow dish containing Belousov-Zhabotinsky reagent. The waves radiate from point sources at a uniform rate of several millimetres per minute, annihilating one another when they collide. Third image in a sequence of three, taken at 1/2-minute intervals.
Model release not required. Property release not required.