The Sun Codex for finishing Lv2 is admittedly a decent prize;
- for early gamer players, it's better culture/tile than most of their regularly available basic culture buildings, and/or only slightly worse but a fraction of the size.
- for later game players (ie: WE's and on), it's a hilariously silly amount of culture that takes up a whopping 4 tiles, making it amazingly space-efficient when their real need is for mana and/or seeds production.
Getting 1590 - 2.9k culture you can slap into a back corner out of the way is nothing to sneeze at.