One of the 39 ink drawings by Ibrahim El Salahi, made during house arrest after he was released from Kober prison in 1976. His drawings are compiled in 'Prison Notebook', published by Sharjah Art Foundation and The Museum of Modern Art, New York. All images of 'Prison Notebook' courtesy Sharjah Art Foundation and The Museum of Modern Art, New York

'Prison Notebook': How Sudanese artist Ibrahim El Salahi transformed his suffering into seminal works