An Essay on the symbolism of arrows in chemistry has appeared in Angewadnte Chemie International Edition.In that paper Santiago Alvarez surveys the chronological milestones of the adoption of chemical equations in books and journals, and of the introduction of arrows to replace the equals sign. It also presents an analysis of a variety of other applications in the chemistry visual language and of possible parallelisms with arrows used in abstract art, notably by Paul Klee, whose painting «Abstract Trio» is shown to be inspired by Jean Perrin’s drawings reporting the observation of the Brownina motion.