Originality and the Fount of Inspiration

Last time, we talked about the source of creativity, now let's look at what I mean by 'originality'

Muse at Mt. Helicon

When I'm judging the quality of something I have read (or even something I have written), I find I have to contend with the idea of 'originality'--what is it that makes something original, or unoriginal? Is originality even a desirable trait for an author to have? Is true originality even possible?

Certainly, we might construct an extreme argument and say that, since all human thought comes from what we learn, from notions that have inspired us, that therefore, every idea has some source and hence cannot be considered 'truly original'. If we defined 'original' as 'something that springs fully-formed from nothing and is not related to anything that came before' then no, there could be no original thought. But it is silly to define originality as some impossible severing of man from influence or history, when in fact those are indispensable parts of the crucible in which original ideas are formed.