National Gallery, London, UK. 26th Oct, 2017. Monochrome: Painting in Black and White explores the tradition in painting mono over 700 years from the Middle Ages, through the Renaissance, up to the 21st century. The exhibition runs from 30 Oct, 2017 - 18 February 2018. Photo: Member of gallery staff in front of Agony in the Garden, 1538. State property on deposit in the Museo Diocesano, Genova. Credit: Malcolm Park/Alamy Live News.