The Arte Concreto — Invención[Concrete Art and Invention] Association’s membership consisted of Edgar Bayley, Antonio Caraduje, Simón Contreras, Manuel Espinosa, Alfredo Hlito, Enio Iommi, Obdulio Landi, Raúl Lozza, Tomás Maldonado, Alberto Molenberg, Primaldo Mónaco, Oscar Núñez, Lidy Prati, Jorge Souza, and Matilde Werbin. Manuel Espinosa, Raúl Lozza, and Tomás Maldonado took turns in the role of Secretary. Later on, Juan Mele, Gregorio Vardanega, and Virgilio Villalba also joined the group. The list of artists whose works were shown at the 4th Arte Concreto — Invención exhibition at the Ateneo Popular in La Boca district of Buenos Aires is as follows: Antonio Caraduje, Espinosa, Hlito, Lozza, Maldonado, Alberto Molenberg, Primaldo Mónaco, Juan Mele, Oscar Núñez, Jorge Souza, Vardanega, and Villalba.
Edgar Bayley is the name that was used by Edgar Maldonado Bayley, the Argentine poet who was born in 1919 and died in 1990. He was one of the group that launched Arturo magazine, and a founding member of the Arte Concreto — InvenciónAssociation. He published numerous collections of poems, stories, and essays, and was also a member of the Poesía Buenos Aires group. This particular item has been included because it refers to one of the exhibitions presented by the Arte Concreto— Invención Association. Furthermore, the prologue confirms the actual date of the exhibition, which has occasionally been incorrectly documented.