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He wrote a Grammaire espagnolle expliquée en Francois (1597) which, according to Amado Alonso, was the model for most grammars written later in other countries such as those by Heinrich Doergangk, Lorenzo Franciosini, Francisco Sobrino and Jerónimo de Texeda, among others.
In 1960, Yvaral co-founded the Groupe de Recherche d’Art Visual (GRAV) with Julio Le Parc, François Morellet, Francisco Sobrino, Horacio Garcia Rossi and Joel Stein, seeking to develop a coherent abstract visual language composed of simple geometric elements.