Signed by...
Yves Klein
Ingmar Bergman
Nancy
Kazimir Malevich
Marcel Duchamp
Jean-Luc Godard
Andy Warhol
Jeff Koons
John Baldessari
Sonic Youth
Luis Buñuel
Christo
Keith Haring
Sol LeWitt
Martin Creed
Mark Rothko
Jean-Michel Basquiat
Yoko Ono
Ben Vautier
Lucio Fontana
Natalia LL
Maurizio Cattelan
David Bowie
Yayoi Kusama
Damien Hirst
Mark E. Smith
Pablo Picasso
Marcel Broodthaers
Ernie Bushmiller
Barbara Kruger
Aphex Twin
The Cure
Man Ray
Woody Guthrie
Edward Ruscha
Marina Abramović
Edward Gorey
Daphne Oram
Roy Lichtenstein
TinTin
Bruce Nauman
Eucharistic Lord
Tove Jansson
David Shrigley
John Waters
Ruth van Beek
Banksy
Raymond Pettibon
John Lennon and Yoko Ono
Stine Marie Jacobsen
Ben Vautier
Richard Prince
Royal Art Lodge
David Shrigley
Charles Bukowski
Gordon Matta - Clark
Ivor Cutler
Keith Arnatt
Jenny Holzer
Cindy Sherman
Dan Flavin
Hannah Wilke
Claire Fontaine
Guerrilla Girls
Sam Durant
Egon Schiele
Ray Johnson
Niki de Saint Phalle
Cornelia Parker
Vija Celmins
Sebastian Errazuriz
Rosemary's Baby 1968
Gerhard Richter
Nam June Paik
Beastie Boys
Jenny Holzer
Andy Warhol
Raymond Pettibon
Barry Le Va
Saul Steinberg
Amalia Ulman
Willem de Ridder
Yoshitomo Nara
Rosemarie Trockel
Banksy
Louise Bourgeois
Helena Almeida
Ana Mendieta
Jackson Pollock
Bruce McLean
Marcel Duchamp
Evelyn Taocheng 
Patrick Guns
Julião Sarmento
Christian Marclay
Jeremy Deller
Horacio Zabala
Tomas Schmit
Salvador Dalí
Arthur Köpcke
Robert Filliou
Paula Rego
Jamie Reid
Ai Weiwei
?

All contracts are altered
by Filipe Matos