2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/150339The aim of the paper is to give an `elementary' introduction to the theory of modules over operads and discuss three prominent examples of these objects - simplex, associahedron (= the Stasheff polyhedron) and cyclohedron (= the compactification of the space of configurations of points on the circle). Keywords: (right) module over an operad, module associated to a cyclic operad, Koszul module over an operad.42 pages, LaTeX, article 12pt + leqno styleAlgebraic GeometryHigh Energy Physics - TheoryQuantum Algebratext