As a design student, I'm privileged enough to be granted free access to the Philadelphia Museum of Art. I've been many times before, both alone and with friends, but my favorite visits were those which were guided by my professors; had my design professor not stopped to ask one of the museum employees for a magnifying glass, we all would have walked by Jan van Eyck's St. Francis of Assisi Receiving the Stigmata without having noticed the ridiculously detailed cityscape background. Every time I leave with the notion that I've seen all there is to see, but once I had several Art History courses under my belt I began to notice and understand things I had not previously. That's all there is to it, being able to notice subtleties that would otherwise go unrecognized.