“In 1966 he made what he considers his first Conceptual piece, which was closer to a relief sculpture than to a print. It consisted of two unpunctuated phrases run together — “This is a Mirror You Are a Written Sentence” — spelled out in raised black plastic lettering against the light ground of what looked like an ordinary pegboard.
What did the words mean? That our reaction, positive or negative, to art is entirely scripted by habit and context? Or is there some other meaning relating to psychoanalytic theories of perception of a kind that fascinated many Latin American artists at that time? One thing was certain: the piece was intended to provoke thought and questions.” (NYT)