There are several. Not according to order.
1. Chopin prelude plays on a bluetooth speaker. The room is dark. My mechanical keyboard emanates light. I solve problems with code. Code that is efficient, ingenious, redable, and scalable.
2. Learning new things in general. Or when it fits already accumulated knowledge. Like a new node in an already existing tree. This is somewhat abstract, sorry.
3. Spending time with SO. Any kind of time. Even mundane tasks like grocery shopping. I love her, and everything about her!
4. Cuddling with the dog. He reciprocates with licks and funny sounds and tail-wagging. Especially if it happens in our mango grove when there is strong breeze and there is no sun.
5. Swimming alone in a pond or lake when there is strong breeze and no sun (overcast). Especially butterfly and swimming face-up with no movement at all, with my ears submerged.
6. Being surrounded by mom and dad and eating special preparation cooked by her with dad reminiscing from his childhood.
7. Sitting in dark on rooftop while there is strong breeze. And reading calm, serene books like The Little Schemer.
8. Learning new Math. Gaining new perspectives, solving new problems.
9. Reading poetry that might not be mainstream but really touches me and are literary masterpieces. Like Vaishnava Padavalis and poems by Michael MS Dutt, and Jibanananda.
10. Being with like minded friends and dipping my feet in a river stream.
11. Understanding a hard, involved topic, and then explaining it plainly to people and when they get it. Especially if there is a strong stigma around the subject/topic being hard.
12. Thinking with writing and gaining new perspectives that I would not have gained without writing. pg talks about thinking with writing often. Also, randomly gaining epiphanies while doing something else.
13. Reciting poetry, especially when somewhat drunk.
14. Climbing highs with elongated period of hard work. Especially highs that I want to climb.
15. Consuming very high quality media of any kind. Like The Wire, Don Quixote, John Coltrane's Jazz, Chopin's Nocturnes, etc.
16. Reading big fat novels that are decades old, in paperback format, idly lying in bed in natural daylight and spending 5-6 hours doing it. Especially if the weather is somewhat hot.
17. After having exercised in the day, and having done deep focused work for some hours, the sleep I go into at night.
18. When I can help people that matters and there is a minor cost to myself. Or I have to work hard to help.
19. When beautiful, mature women pay attention to me/stare at me.