HZERO is the innovative museum project that comes to life in the spaces of the former Ariston cinema in Florence and explores the imagery of trains starting from the model railway created by Giuseppe Paternò Castello di San Giuliano. HZERO comes to life from the model itself, the protagonist of a real choreography of lights, sounds, and projections specifically designed to enhance its scenic effect. The visit path is enriched by temporary exhibitions and a program of educational workshops for adults and children. Maintaining the connection between the world of modeling and the dimensions of play, invention, and craftsmanship, to rediscover the poetry of a complex and fascinating universe like that of trains.