For most of us, our sense of vision, of seeing something in the world, comes as the most natural thing, worthy of no more thought. How many of us can remember that childhood episode of peekaboo when we learnt that just closing our eyes cannot make us or anyone else disappear? Sight comes so naturally to so many of us that we don’t think of it as a complex phenomenon happening in the background. Whether we’re watching fireworks lighting up the sky or staring at a TV screen, there’s incredible co...