Thinking on the bus today: if souls are like windows, to let in the light, or let out the light, and the soul of an innocent is pure and clear and passes through the light unaltered -- that is not the only sort of window that there is. Most people are more broken than that, and color things some. So, if one is to be the best window that one can be, it behooves one to be broken and colored in interesting ways, meaningful ways: stained glass window. And it was accompanied by the mental picture of a Slytherin house logo stained-glass window.
Interesting moments, I have, especially when slightly low on blood. (Not sanguine enough?)