Travelling, art, extreme sports, music, ducati's, tattoo art, photography, reading anything on Greek & Roman Philosophy, Humanism, Economics, Quantum physics, or works by:
D. Hofstadter, Heidegger, Kant, Goethe, Bauer, Feuerbach, Lenin, Marx, Schelling, Kierkegaard, Schopenhauer, Nietzsche, Freud, Hegel, Bradley, Dewey, Greene, Kojève, Žižek, Sartre, Descartes, Voltaire, Roussau, Peirce, Russell, Machiavelli, Hồ Chí Minh, Mao, Sun Tzu, Küng, Leizi, Gandhi, Kǒng Fūzǐ(Confucius)