This is a vented window, leading to an underground public convinience in Auckland, New Zealand.
Rear passenger window on a long derelict automobile
This series (of which there are many more) was shot at an old car breakers yard here in New Zealand. There are literally thousands of wrecks ranging from old Ford Models with wooden spokes in the wheels (Model T?) to more recent wrecks.
Many of the windshields were cracked and discolored and milky with age from decades sat in the harsh New Zealand sun.
Many more can be seen HERE