Art or jewellery asks Ming Liu. Jewellery galleriest Louisa Guinness has collaborated with artists from Anish Kapoor to Antony Gormley - and now multidisciplinary talent Ron Arad. This new exhibition, until April 8, speaks to Arad's quirkiness and use of unexpected materials. Laser-sintered polymide and rapid prototyping are the mechanisims behind the Hot Ingo collection (including earrings, pictured), which is a wonderful. high-tech homage to its namesake, lighting maestro Ingo Maurer, a longstanding friend and collaborator of Arad.