These are the ten books that influenced me the most:

The Lord of Rings, J. R. R. Tolkien

Godel, Escher & Bach, Douglas Hofstadter

Man & His Symbols, C. Jung

The Glass Bead Game, Hermann Hesse

Tao te Ching, Lao Tszu

The Pursuit of Loneliness, Phillip Slater

The Bible

A Perfect Vacuum, Stanislaw Lem

Formalized Music, I. Xenakis

Laws of Form, G. Spencer Brown

The Moon is a Harsh Mistress, Robert Heinlein

Alice in Wonderland // Through the Looking Glass, Lewis Carroll

The Politics of Experience, R. D. Laing

OK, so that's 13. Tough.