Fiona rolls her eyes.<br/><br/>"Look, Pro-Ep is clockwork, right?  Only a thaumaturgical engine isn't the same as muggle clockwork.  That only turns mechanical motion into other mechanical motions.  A thaum-engine turns mechanical motion into a thaumic field with a high potential and a directed focus.  They're completely different.  But because they<em>look</em>the same, many wizards jump to the obvious, wrong conclusion.  That's like saying that...uhm..."<br/><br/>She screws her face up in thought.<br/><br/>"Quidditch.  It's like saying that all teams are fundamentally the same because they have the same positions.  Do we play the same sort of match as, say, the Gryffindors?  Or the Slytherin?"