This doesn't need any comment from me:
"Art-O-Meter is a device that measures the quality of an art piece. It bases its evaluation on the amount of time that people spend in front of an artwork compared to the total time of exhibition. The measurements are graphically represented by comments and a 5 star rating system.
Without the interaction of a viewer, the Art-O-Meter will register time like a regular clock. However, when a user enters the area covered by its motion sensor, a second timer is triggered and it will count time as the viewer observes the artwork."