During a few decades of dramatic social change and optimism, artists in Montevideo, Buenos Aires, S?o Paulo, Rio de Janeiro and Caracas developed a new "concrete" language independent of representative imagery. Concrete Matters presents some 70 works from the mid-1930s to the 1970s by artists who developed concrete art. It highlights the Brazilian neo-concrete movement, with artists such as Lygia Clark, Willys de Castro and Heli? Oiticica,...