An MIT "hack" is an ingenious, benign, and anonymous prank or practical joke, often requiring engineering or scientific expertise and often pulled off under cover of darkness - instances of campus mischief sometimes coinciding with April Fool"s Day, final exams, or commencement. (It should not be confused with the sometimes nonbenign phenomenon of computer hacking.) Noteworthy MIT hacks over the years include the legendary Harvard-Yale Football Game Hack (when a weather balloon emblazoned "MIT" popped out of the ground near the 50-yard line), the campus police car found perched on the Great Dome, the apparent disappearance of the Institute president"s office, and a faux cathedral (complete with stained glass windows, organ, and wedding ceremony) in a lobby. Hacks are by their nature ephemeral, although they live on in the memory of both perpetrators and spectators. Nightwork, drawing on the MIT Museum"s unique collection of hack-related photographs and other materials, describes and...