Just imagine having a room with an invisible touch sensitive sensor instead of a clearly visible light switch.
Sounds like modern monitors. If you're lucky there will be some symbols at the bottom that indicate that if you fondle something, somewhere in the area then something might happen. If you're not lucky then you get to thoroughly molest the poor thing. I must say though, as an IT person, I do get a perverted thrill out of asking "how do you turn this on?"