"The first South American mail art exhibition was in Montevideo (Uruguay). It was organized by Clémente Padín under the title Festival de la Postal Creativa, in the Galeria U, and ran from October 11 to 24,1974. Although it contained only one branch of mail art, the postcard, it was an enormous exhibition, almost exhaustive, where all the possible permutations of the postcard could be found. The reading of the exhibition presented a new phenomenon, since the cards, which were tied to the ceiling, hung down. The spectator, in addition to touching the work without impediment, could, if he dared, carry away a souvenir."
Vigo, Edgardo-Antonio:
The State of Mail Art in South America, in: Correspondence Art. Source Book for Network of International Postal Art Activity, Contemporary Art Press, San Francisco, 1984, pp. 349–367. (Ed. by Michael Crane – Mary Stofflet)