Since the start of his career Hersúa has been interested in subversive, public, and participatory art, primarily designed for open-air spaces, and has exhibited his sculptures all over the world. "The sculptor no longer handles volumes or masses, but spaces. The creation of public art in the city has to be done based on the structuring of spaces. For this, it is necessary to know the evolution of architecture and have cultural knowledge, in addition to artistic knowledge, to which nonconformity must be added." Art critic Juan Acha, Excelsior, October 1986.