How can there be design without a designer?

Sinner: Surely the ultimate designer must have had a maker,
a designer and that designer must have...I mean how can there be design without 
a designer?
Saint: Well I will explain, the ultimate designer was causa sui 
Sinner: Causa sui?
Saint:  Yes, it means cause of itself in Latin. It denotes something which 
is generated within itself.
Sinner: Hmm...causa sui...similar in way to 'knowledge' existing without ant person 
creating it.
Saint: I'm sorry, how can that be?
Sinner: Evolution.