Thomas - my curiosity is engaged. Are we looking out the back of the car? I am looking at that little hump shape, which could be the spot for a rear wiper??
Eah, yes. Had to look myself. Thanks for your interest!
Looking back in the middle through the back window.
Dark shadow: middle back seat headrest.
Bump shape: rear wiper (motor).
Rectengular window shapes: somewhat west looking windows of the washing plant door system.
Water drops and foam attach to the dirt better than to the wiper cleaned area, which makes up for the semi circle contour.
A lot of dirt just below the roof edge spoiler catching a sun ray
.