Robert Ryman: The Real Thing

In 1958 Robert Ryman was a security guard at the Museum of Modern Art in New York, a jazz saxophonist who had taken the job to pay the bills. That year he made Untitled, a painting inspired by Mark Rothko, and it is one of the earliest works here.

There are over 60 paintings, from the mid-1950s to the early 2010s, mostly white and mostly square, on canvas, steel, fibreglass, Plexiglas and coffee filter paper. Upstairs covers his music, his studio, his signature and the fixings he left on show. Downstairs, works from across his career are hung for how they look together.

Give a painting a few minutes and the whites start to separate: the Guardian's critic found his notebook's white pages had gone "a ghastly yellow-brown". Your landlord's brilliant white won't survive the visit either. He found revelations, then felt "trapped in this controlled space"; The Arts Desk said "It doesn't get any better than this." Thursday evenings from 5pm and Friday mornings are Pay What You Can.