an observer on some suitable high point , let 's say for the sake of argument a wisp of cirro-stratus on the edge of space , would remark on how lovingly the light spreads across the land , how it leaps forward on the plains and slows down when it encounters high ground , how beautifully it ... . actually , there are some kinds of observers who , faced with all this beauty , will whine that you ca n't have heavy light and certainly would n't be able to see it , even if you could .