[GREETING CARDS]. Set of 6 greeting cards, including at least 4 published by Del Arco, addressed to Jean-Loup Philippe, illustrated by 5 different artists: Each card is composed of 2 in-8 sheets including on the recto of the second a signed work by Victor LAKS (1924-2011) (original serigraph in artist's proof, with autograph greetings from the artist opposite), the same numbered 318/350, Constantin XENAKIS (1931-2020) (original silkscreen numbered 101/400), Vladimir VELICKOVIC (1935-2019) (silkscreen numbered 53/400), Michel RONCEREL (1946-2007) (etching numbered 54/100, with autograph greetings opposite), and Henri PATEZ (1927-2014) (silkscreen numbered 135/150).