Collingwood on philistines on modern art

I'm reading R. G. Collingwood's The Principles of Art for college. It's one of the best works of philosophy I've read in a long time, and may well be the best work on aesthetics I've ever read. It is softly spoken genius, and often extremely witty, in its gentle, dry English way. One of the passages that made me laugh aloud is this part of a footnote (p. 145 of my edition):

The man in the street thinks that [traditional use of perspective, etc., has been abandoned in Cézanne et al] because these modern fellows can't draw; which is like thinking that young men of the Royal Air Force career about in the sky because they can't walk.