Block
From wiki.phychi.com
A block is a union of properties inside the game. It has a functional size of 1m³. The world is built out of blocks, so you can create things like castles easily and confortably. Mods may change this fixed block thing and add subblocks or rotatable systems.
- [#System|System]
System
Each block however is part of a reference system, e.g. a big ship, the world itself, a rotating carussel, ... just let your imagination running. The basic game supports 12700 different blocks/items where a block never should use two ids for a two different states if the behavior of the block stays the same.