We were watching an old 1934 Gable movie and they had a switch on the wall with two wires coming down that looked like K&T but it was a surface run.
I Stumbled across an episode of Hogan's Heroes
last night, where Colonel Klink was, once again, nearly being sent to the Russian Front for Combat duty.
During the scenes, when Major Hocksteter (Sp???) was tearing Klink a new one, the Camera angle showed the Entrance Door to Klink's Office.
On the Right side of the Door, is a Surface Mounted "Rocker" Switch (Two Push Buttons; One for "OFF" at the top, One for "ON" at the bottom).
The Switch is connected via exposed, Surface Mounted Wiring, in the form of a Two-Wire twisted pair of Brown Insulated Conductors, possibly #14 Gauge.
The outcome for Klink was typical; Hogan's Sabotage Unit got Klink cleared of the Charges, then made Hocksteter a Hero - which kept Klink away from the Sub-Zero Frontline gig; and all was happy once again.