This document discusses several avant-garde sculptors and their techniques from the early 20th century. Pablo Gargallo pioneered the use of sheet metal and assemblage techniques to create dramatic sculptures. Julio Gonzalez was a blacksmith who used iron rods to reproduce figures and penetrate space. Alexander Calder was known for his delicate wire sculptures and mobile sculptures. Alberto Giacometti experimented with surrealism and sought to realistically depict figures in space through elongation and using armatures. He discovered this approach more accurately portrayed the appearance of people at a distance.