THE WORLD AND ARCHITECTURE
The milki world is very equivalent to ours! Some milki live in rural areas, some live in cities, some say 'to heck with it' with staying in one place and live their life going place to place in a van. There's trees, clouds, rivers, mountains... etc. The only key differences between their world and ours is the milk rivers, the source of all life for milkis.
Below is some general ideas you can use for your milkis story! You don't have to follow these ideas, as your milki's story is up to you, but if you need ideas, here's a few you're welcome to use!
Architecture: Milkis as a whole are very naturally skilled with glass craftsman ship. They are naturally very good at it! A lot of milki architecture utilize glass in many ways. They often have big windows, and full mirror walls, pretty glass pillars to hold things up. More expensive/important buildings have intricate stained glass windows and sculpted glass pillars