Fun Theory
What makes life worth living? Survival pressure (the subjective experience thereof) confounds our direct experience of this; so to begin with, we can try to factor it out and look at what's left. Then it seems like subjectivity carries a lot of bugs that keep the subjective perception of survival pressure alive: social structures seem to freeze us into various coping mechanisms for the mortal question, that make it letent but inescapable. Try, though it's hard to do, to factor that out too. What's left?