The following is an excerpt of Ryūnosuke Akutagawa's novel The life of a fool:
He read a book by Anatole France, his head propped up by a pillow of skepticism exuding a rosy fragrance; the presence in that same pillow of a centaur quite escaped his notice.
Having read some novels written by France, I trust I understand the first part that comes before the semicolon, but this reference to a centaur just escapes my understanding. As far as know centaurs were considered to be symbols of wisdom (apart from some other qualities).