He looks a little surprised, but grins. "I'm not used to people actually caring. ... The simplest way to think of it is just that - a weave, like thread in a loom. It suffuses reality, and to do magic is to tug the thread this way and that into the pattern we want. Wizards and some warlocks and other spellcasters do this, though sorcerers have a much deeper connection with the weave. Druids and clerics get their magic from other places - their gods and nature, respectively."