That must be the thing that renders all the graphics. The creative heart of the Information Superhighway. Once it's upgraded, the manual says it will offer 256 stunning colors! But my favorite color will always be green.
Graphic Processing Unit is a level in the video game World of Goo. It is the fourth level of Chapter 4. Here, Infected Goo must be launched to extend a structure enough in order to reach a pipe and then Goos must be launched into the structure to reach the pipe. The Launch Goos must be used to wake up the sleeping Infected Goos. What makes this level possible is the gravity field around the central sphere, which causes Goos to orbit it.
Like most levels in Chapter 4, the name of the level refers to an actual component in a computer (as Chapter 4 is basically a large desktop). A GPU is used for graphics on actual computers.