María Freire (Uruguay 1917-2015), a pioneer in geometric abstraction in painting and sculpture, is a reference in Latin American concrete art. Her work, extensive and rich as her career, surprises with the research she carried out, developing her own language of abstract figures. Her disruptive work, her indomitable character and her active presence in the delivery of knowledge – as critic and teacher – made her transcend, through a unique and key creation to understand the ways in which the birth of contemporary art in her country and the region was prepared.