Very hard to narrow down from all the books I have read.
Childhood shout out first.
Age 11-13 I went on a sci-fi/fantasy bender.
The main players were LOTR, The Hobbit, Dune, war of the worlds, the time machine, the chronicles of thomas covenant, the golden torc series, a wizard of earthsea, the foundation series, and stranger in a strange land.
As for the rest…these were the ones that really came to mind when I cast it back over the years. There are probably tons more…gotta stop somewhere.
Beyond the Brain - Stanislav Grof
Programming and Metaprogramming in the Human Biocomputer - Dr John C. Lilly
The Last Temptation of Christ - Nikos Kazantzakis
The Teachings of Don Juan - Carlos Castaneda
One Hundred Years of Solitude- Gabriel García Márquez
The green house - Jorge Mario Pedro Vargas Llosa
The Wasp Factory - Iain Banks.
Midnight’s Children - Salman Rushdie
White Teeth - Zadie Smith
Heart of darkness - Joseph Conrad
the world according to garp - John Irving
Das Parfum - Patrick Süskind
The Hitchhiker’s Guide to the Galaxy - Douglas Adams
catch 22 - Joseph Heller
Walden - Henry David Thoreau
The Unbearable Lightness of Being - Milan Kundera
Prometheus rising - Robert Anton Wilson
A brief history of everything - Ken Wilber
Zen and the art of motorcycle maintainence - Robert M. Pirsig
The Varieties of Religious Experience - William James
The great war for civilisation - Robert Fisk
Obscenity, Anarchy, Reality - Crispin Sartwell
Crime and Punishment - Fyodor Dostoyevsky
The Road to Wigan Pier - George Orwell
I have always enjoyed reading books that fuck with my understanding of how I think things work and how life is and that challenge my veiwpoints.