I feel half-superhero, half-idiot. The jacket I’m wearing is letting me fly a drone around a virtual university campus just by spreading my arms and moving my body from side to side – like a kid pretending to be a plane. And a virtual reality headset gives me a perfect bird’s-eye view. But I’m sitting in the Swiss embassy in London, with the jacket’s creators looking at me across a table wondering if I’m going to fall off my chair.