Scallops are clam shell shaped indentations that form regular patterns in the walls of caves. The figure shows scalloping on an ice cave below the snout of Vernagtferner, Ötztal Alps, Austria. The author presents a mathematical model for the formation of scallops in ice or limestone caves. See the article “The formation of cave scallops” by Andrew Fowler published in Proc. R. Soc. A (https://doi.org/10.1098/rspa.2025.0033).