Gödel, Escher, Bach completely blew me away and quite radically changed the way I looked at the world. Highly recommended.
14 karma · joined September 3, 2018
Otherwise, reading. If you have enough energy, read literary classics or non-fiction, the type that challenges you and/or teaches you new things. If you don't have enough energy, read something lighter - I am reading Alice's Adventures in Wonderland currently, for example, which is fun and relaxing. Finishing a book is a nice feeling, plus the mental focus on the story and on yourself can give rise to some nice insights on yourself, people, and the world.