la double vie de veronique

"Have you ever noticed how many important things go only one direction?
Rain and songs, clocks, how toenails grow, and books, for instance.
Wouldn't it be nice if at least one important thing went in both directions?

This book does. You can read it left to right and right to left,
back and forth, forth and back.

And when you read a book in two directions
you may notice some things in a new way.

Now, if we could only do something about your toenails..."