2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135304We discuss a superluminal unphysical motion which, we believe, has a high pedagogical potential. It highlights the physics behind the concept of simultaneity in special relativity and illustrates the non-physical character of superluminal speeds offering a rewarding exercise in handling the Minkowski space-time diagram.8 pages, 6 figures, Submitted on July/30/2007General Physicstext