Let us imagine Galileo locked up with a photodiode in a room that alternately lights up and darkens. Both can indicate whether it is lit or not. If Galileo is aware of it, why not say that the photodiode is too? Through a series of thought experiments, which Galileo invented, this book seeks to solve the enigma of consciousness. How is consciousness produced by the brain? Is it always? Is a dreamless sleep a state of consciousness? Do the right brain...