Eduardo Chillida- Gravitation   ink and hand-made paper collage with string   Executed in 1989

'Gravitation' by Spanish artist Eduardo Chillida Ink & hand-made paper collage with string, via Christies

Josef Albers. Grey Instrumentation II. 1975

Josef Albers: Grey Instrumentation II, One from a portfolio of twelve screenprints. Museum of Modern Art, New York, Gift of the Josef and Anni Albers Foundation. © 2015 The Josef and Anni Albers Foundation / Artists Rights Society (ARS), New York.