Yes, imaginary. You place the Canestasized (my word) device on a table or desk and it projects a laser image of a keyboard onto the flat service. As you peck away on the projected image, Canesta's "electronic perception technology" turns the movement of your fingers into keystrokes. The faux keyboard can even function like a mouse.
I really dont know if i can type without real keys to touch... anyway it is a cool thing.