It took the British Museum eight days to discover the `` prehistoric '' rock painting of a man with a shopping trolley in the British Museum Banksy has hung on a wall . British graphic artist 's identity remains a mystery despite huge publicity . People by the art world and Hollywood celebrities count among his collectors . Despite this local authorities have protected his public image .
British graphic artist 's identity remains a mystery despite huge publicity . People by the art world and Hollywood celebrities count among his collectors . Despite this local authorities have protected his public image .