Art reviews: Jack Knox shows at GoMA and Cyril Gerber Fine Art

If you were shown Jack Knox’s 1968 painting How it is devoid of context, without an artist’s name, era or location, you might find yourself momentarily nonplussed. I confess I might. Was this painted in the East Village, by an artist playing around on the cusp of abstract expressionism and pop art? Or by a postgraduate student in Glasgow the week before last?