[As in, if I want to use one, I use one - I just prefer to be decently sure that I want to use one. Triangles do tiny things. Flick lightswitches across the room, hurry along kitchen tasks like boiling water, banish itches in inconvenient locations in the middle of your back, whatever. I'll give you a bagful as a signing bonus into the conspiracy if you like. You could probably do creative productive things if you wanted, with a triangle - I'd use one to pull a fire alarm anonymously if I wanted a building evacuated, for instance. Squares are next up and if I were dealing with coin scarcity I'd use more of them than anything else. They can conjure inherently nonmagical medium-sized physical objects, perform tasks a grade up from triangle sorts of things, grant temporary nonmagical skills - it's disconcerting as hell when those go away though - and make illusions that stay put till you want them gone. Pentagons are good for permanent nonmagical skills, like my languages and stuff, and they can also conjure modestly magical objects, like my kickass motorcycle or appliances that don't need electricity. Hexes are good for permanent magical superpowers - stuff the X-Men could do, except it's worth being careful in design - and big, complicated makings-of-stuff, like doors that lead hundreds or thousands of miles away.]