Everything,' his father said, 'comes down to time in the end--to the passing of time, to changing. Ever thought of that? Anything that makes you happy or sad, isn't it all based on minutes going by? Isn't sadness wishing time back again? Even big things--even mourning a death: aren't you really just wishing to have the time back when that person was alive? Or photos--ever notice old photographs? How wistful they make you feel? ... Isn't it just that time for once is stopped that makes you wistful? If only you could turn it back again, you think. If only you could change this or that, undo what you have done, if only you could roll the minutes the other way, for once.