Roman Opalka : time passing / Karlyn De Jongh, Sarah Gold ; photos by GlobalArtAffairs Foundation ; concept by Rene Rietmeyer, Karlyn De Jongh & Sarah Gold

Roman Opalka : time passing / Karlyn De Jongh, Sarah Gold ; photos by GlobalArtAffairs Foundation ; concept by Rene Rietmeyer, Karlyn De Jongh & Sarah Gold