This is a watercolor painting by Margaret Nelson, inspired by an illustration of a Belousov-Zhabotinsky reaction also created by Margaret Nelson for Steven Strogatz for his book "SYNC: The Emerging Science of Spontaneous Order."
Picture of A. T. Winfree at the wine estate Cháteau Mouton Rothschild in the village of Pauillac near Bordeaux, France (M. Orban and E. Koros in the background) during the 2nd Bordeaux Meeting in 1981