Seeing VS Observing

I could not help laughing at the ease with which he explained his process of deduction. 'When I hear you give your reasons,' I remarked, 'the thing always appears to me to be so ridiculously simple that I could easily do it myself, though at each successive instance of your reasoning I am baffled, until you explain your process. And yet I believe that my eyes are as good as yours.' 'Quite so,' he answered, lighting a cigarette, and throwing himself down into an arm-chair. 'You see, but you d...