Some days ago I received a letter from Mr. Jagger asking me to design a picture or to place at his disposal unpublished work to reproduce on the cover-sleeve for an LP record.
My answer to both questions must be no, as I want to devote all my time and attention to the many commitments I made; I cannot possibly accept any further assignments or spend any time on publicity.
By the way, please tell Mr. Jagger I am not Maurits to him, but
M. C. Escher
— Carta de M. C. Escher em resposta a Mick Jagger dos Rolling Stone, 20 de Janeiro de 1970