Living NPC pattern sentence?

[droqen]

CARING FOR NPCS - You need the ILLUSION OF LIFE, and then it's just a matter of giving opportunities for caring...
ILLUSION OF LIFE - This is "Internal Logic" + "Internal Chaos" arranged just so.
INTERNAL LOGIC - How do you create this?
INTERNAL CHAOS - I think I really need to define this one

Yes, I need some more patterns for relying on NPCs - there's illusion of life but also "RELYING ON SYSTEMS" or something like that? Hmm