Dan Graham obituary

Artist whose prodigious career spanned video, photography, sculpture and performanceHumour, anthropology and psychoanalytic theory may not be natural bedfellows, but the artist Dan Graham spent more than 50 years utilising all three in a prodigious career that encompassed photography, video, performance and sculpture and strayed into architecture, astrology and music criticism.In 1966, Graham, who has died aged 79, was travelling on a train from Manhattan to New Jersey when he saw a subtle patte