Lars Fisk is a balls to the wall sort of artist. And not just balls to the wall, but balls to the floor, the grass, wherever. The American sculptor, you see, turns objects into balls. He’s made circular cottages, campervans and tractors. And now, in his new London exhibition, he’s showing off a bunch of new circular objects including some big circular lederhosen. Zehr gut. Finally, art for people with a phobia of right angles.