http://www.core77.com/posts/28087/SVA-Students-Object-Sensitive-Infinity-Mirror-Table

This is called Infinitum, a table that encourages people to be neat and tidy. It works by having a sensor that picks up the vibrations of objects being placed on the table. Once the sensor is activated, the led lights turn on and stay on until all the objects are removed. This makes it so that users have to clear the table whenever they're done using the space. I was inspired by this student's work because it's encouraging good habits by amplifying the consequences. For example, without the magnification (infinity lights), a user might feel like a single row of lights staying on isn't a big deal. However, when it looks like 100 lights are being kept lit from their mess, the table commands more attention and more guilt for using electricity.