The game world is procedurally generated as players explore it, using a seed which is obtained from the system clock at the time of world creation unless manually specified by the player.[19][20] Although limits exist on vertical movement both up and down, Minecraft allows for an infinitely large game world to be generated on the horizontal plane, only running into technical problems when extremely distant locations are reached.[nb 1] The game achieves this by splitting the game world data into smaller sections called "chunks", which are only created or loaded into memory when players are nearby.
The game's physics system, in which most solid blocks are unaffected by gravity, has often been described as unrealistic by commentators.[21] Liquids in the game flow from a source, a liquid block which can be removed by placing a solid block in place of it. Complex systems can be built using primitive mechanical devices, electrical circuits, and logic gates built with an in-game material known as redstone.[22]
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