Relationship between life and death. inside, outside: No information about this but it is two different photographs put together to create a half skull, half face image. That heavily relates to the theme of inside, outside and in between.
I like how interesting the camera angle and shot type is able to make something so mundane seem so vivid. This filming through a window could be a good way to get down the mundane nature of the montage without being too boring in the visuals.