I really love Physics because everything is explained solely by logic. There is no prejudice, no preconceived ideas, nothing based on one's own opinion, and everything is beautifully brought together in order to make sense as a whole. The fact that it can sometimes be counter-intuitive also fascinates me as it makes me see the world in a different way, and I feel an immense satisfaction when I ponder over something or learn something new and I end up saying to myself "Then that's why this happens!".
The same applies to Mathematics, although in this case it's its abstract component that's so delightful. A mathematical reasoning (whether it's applied to Physics or Mathematics) seems inexplicably beautiful to me. Both Mathematics and Physics also originate philosophical questioning and doubting.
Living an existence that appears to be meaningless to me, Mathematics and Physics are two of the few things that actually make me smile.