Learning Zen is a phenomenon of gold and dung. Before you understand it, it's like gold; after you understand it, it's like dung.
HIPPOGRIFF, n. An animal (now extinct) which was half horse and half griffin. The griffin was a compound creature, half lion and half eagle. The hippogriff was, therefore, only one quarter eagle, which is $2.50 in gold. Zoology is full of surprises.