Bokelskere.no

Sitting at his desk in the closeness of the evening, young Emmanuel is reading a book he doesn't understand. Written on the yellow page that shines in the electric light, underneath some regular drawings in the shape of a star, are the words:

(...)

PTOLEMY'S THEOREM A quadrilateral is inscribable in a circle when the product of its diagonals is equal to the sum of the products of opposite sides.

But it might as well have read: A convex coleopter is imputrescible when the product of the bacchanalia is equal to the sum of the products of the possible pies.