Oh, what a bummer that you don't have your art books anymore! Unless you like the extra open space, in which case I suppose I should congratulate you on helping high school students to broaden their artistic horizons. Donating books is never a bad move, really.

There are days when I'd like to be a minimalist. I have gotten to the point in my life of "will I read this again before I die" (in 30 or 40 years, but still) and have donated many books based on that criteria.