2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/129611We present a small 4-dimensional polyhedral realization of a 2-dimensional Z-acyclic but non-contractible simplicial complex.3 pages, 3 figures, submitted to Electronic Geometry ModelsMetric GeometryAlgebraic Geometry52B99; 57Q15; 51M20text