Grammatical accuracy of tone

And  the  best  proof  of  the  grammatical accuracy of the tones of Turner is in the perfect and unchanging influence of all his pictures at any distance. We approach only to follow the sunshine into every cranny of the leafage, and retire only to feel it diffused over the scene, the whole picture glowing like a sun or star at whatever distance we stand, and lighting the air between us and it; while many even of the best pictures of  Claude must be looked close into to be felt, and lose light every foot that we retire. The smallest of the three sea-ports in the National Gallery is valuable and right in tone, when we are close to it; but ten yards off, it is all brickdust, offensively and evidently false in its whole hue.

MP I p. 274