Experiments in Communication

For the first Networked Objects assignment we had to choose a thing, an action, and a response from a list and improvise. I choose "caress", "cup" and "color" and made a cup that changes color when caressed.
The circuit is really simple. There are two photo cells on the surface of the cup, each of which is connected to one of the G and B pins of an RGB LED. As you cover each of the photocells with your fingers, the color of the LED changes from turquoise to a bluer or a greener tint. It also dims if you cover both of the photocells at once.

Here is a video of the cup in action (double-click to play):