Terrain
Terrain is an area of land, usually referred for just a lot but not limited in that scope. Players can modify it by terraforming or painting it through build mode tools. Elements can affect the said terrain, such as snow and rain. Certain objects, especially outdoor plants, can only be place on empty terrain (unless cheats are used). There are also certain interactions and activities limited to empty terrain that can't be performed anywhere else, including but not limited to catching insects or bugs, collecting, doing various snow activities (making snow angels, building snowmen and having snowball fights), having water balloon fights, watching stars, etc.