Personally, I find the link between films such as the Cabinet of Dr. Caligari (bottom photo) and established Film Noir such as Scarlet Street (top photo) to be very interesting. The fact that German expressionism as an artistic movement translated thoroughly from canvas into a film study is fascinating, given the time. Film and photography were very much burgeoning art forms at the turn of the century, with some photographers desperate to prove that their trade could be considered a 'fine art'. The fact that expressionism translated so well into film is amazing. 

Oblique angles and strange geometry often play a huge part in expressionist art, and later this translated to noir. Within the bottom photo, the projection of the window upon the wall is ample evidence of this 'strange' geometry. What is also interesting is that in the above photo, the actual angles containing the lamp are similar to the ones projected on the wall in the lower photo, albeit a little twisted and vertical in orientation. The point being that the aesthetics of angles within both genres of art are important to their respective genres.