This already happened in R W Fassbinder's Welt am Draht (1973) where when you are visiting the hotel in the simulation and your time's over, a bell boy with a chalked notice on a portable blackboard will walk through the hall to alert you to answer the phone in a specific telephone booth. We had a future to look forward to!, and now it's come to this—flat interfaces.

Renders as dotmatrix printer paper out of your virtual fax machine.