Nikhil Chopra: Artist highlights Manchester's heritage An artist from India has spent three days and nights creating a piece of art at the Whitworth Art Gallery in Manchester. Nikhil Chopra's performance, Coal on Cotton, saw the gallery open continuously from dawn at 04:48 GMT on Friday 5 July to sunset at 21:37 BST on Sunday 7 July. During that time he used the two materials to illustrate the city's mercantile past as part of the Manchester International Festival.