“Ken Simons has had his hands on Picasso paintings, moved Tracey Emin’s bed and manoeuvred an Antony Gormley sculpture though a third-floor window. For him, a famous painting or sculpture isn’t just a precious creation to be admired – it’s a practical puzzle. Will it fit through the door? How can it be carried? Which trolley is best to wheel it through the gallery? And, in the case of some outlandish modern sculptures – how does it fit together?”