Faceplates come in 4 and 8 inch diameters. These are mounted to the headstock spindle of a wood lathe and can be screwed to a block for turning. They are often used to create bowls and other circular objects.
The Faceplate is your physical connection to the Technology Environment, much like an electrical outlet is your physical connection to the electricity in your home. In other words: it's where you plug in. Most of the Case Campus faceplates are fiber optic.