Thomas Murphy has been building interactive science tinged art installations for the last 10 years, starting in Hackney, in London and then moving the Wellington, New Zealand. His 2008 Fringe show, Fan-o-Tron, was a big hit, and he's back this year with another, bigger installation with self cancelling sound beams disrupted by the audience and a room with back projected video of the contents of the room fed back with delays of seconds to several minutes.