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Anyone else hate terrain made of bricks? I feel like "lore" wise, actual Lego pieces should be restricted to minifig-made objects and "living" things like animals and trees. The actual ground, water, and air are *not* Lego.
The old Rock Raiders game confirms "Lego ore" is excavated and refined into usable material, presumably bricks. If you look at the backgrounds of any box art or marketing photo from any point in Lego's history, the sets are clearly against a backdrop of more "real" terrain and environment. It only makes sense that only the built environment consists of Lego, not the natural one. As for the plants and animals, we can assume some sort of "biological" process is able to convert base materials into a more refined Lego form, much in the same way that trees turn soil and water into wood, a building material.
This theory ignores the licensed Lego games because they do stupid shit like only making interactable objects out of Lego, while most structures are just "realistic" stuff.