As noted in Ref. , the first appearance of the 'particle-in-a-box' problem appears to be in a summary textbook by Mott from 1930 . His presentation of the infinite square well¾the problem of a particle in one dimension trapped between two impenetrable 'walls' (representing a 'well')¾ permits a quantized set of eigenfunctions. It has a readily interpretable classical analog in a standing wave with fixed ends. This conceptual model is a tool for pedagogy and introduces the properties of confinement, quantization, and degeneracy¾the understanding of all of which are requisite in navigating quantum phenomena.