Optimists are often accused of seeing the world through rose-tinted spectacles. But surely better by far to colour one's vision in this way than to peer out at the universe through a welder's helmet. When we limit the amount of light that reaches our retina, everything starts to look dark. But that doesn't mean that the world actually is so featureless and grey. Now, what's really on your horizon? If you can't see an opportunity, that's not because it isn't there. It's because you aren't looking for it properly!