It is no exaggeration to say that Francesc Galí (Barcelona 1880-1965) risked his life to paint the murals on the dome of the National Palace coinciding with the Universal Exhibition of 1929. For about six months, Galí worked perched on rather precarious scaffolding and without protective measures, just as the Catalan Art Museum (MNAC) is dedicating to him from this Wednesday until September 14, entitled Francisco Galí. The invisible teacher.