CHICAGO — Ever watched a show from a box at the side of the stage?Didn’t think so.Although boxes remain a dominant part of theater architecture, they’ve gone from highly desirable to barely salable over the last hundred years.The sightlines are lousy. The view off into one of the wings is weird. Directors and actors hate how they intrude. And unless you truly are an exhibitionist, who wants to be strutted out on display like some big-ego Parisian fop at La Comedie-Francaise?Boxes are so out of style that, if you’re watching a Broadway musical in New York or Chicago, you might well find them oc…