Back in 2006, Jeff Han gave an astonishing demo at the TED conference of a new touchscreen technology called ‘multitouch’. You can watch the video online: as Han uses both his hands to zoom, rotate and pan through a stack of photos, the audience applauds. A year later, Steve Jobs would demo the first iPhone, with the Photos app’s ‘pinchto-zoom’ multi-touch gesture debuting to cheers from the faithful. It might seem like old hat now, but
