A story that deserves a second and third chance

What is beauty? Is it a measurable fact (Gottfried Leibniz), or merely an opinion (David Hume), or is it a little of each, colored by the immediate state of mind of the observer (Immanuel Kant)?

This is a real story. Joshua Bell playing incognito in the metro station was organized by the Washington Post as part of an social experiment about perception, taste and priorities of people. The outlines were: in a commonplace environment at an inappropriate hour: Do we perceive beauty? Do we stop to appreciate it? Do we recognize the talent in an unexpected context?

Source: http://www.huffingtonpost.com/2009/01/15/the-things-we-miss-a-viol_n_158188.html