When thinking of depth the first movie that comes to mind is the film Inception. When I think of this film I just remembered all of the buildings and how they would shift and move into different places to create the illusion that they were in front of you one minute and the next they were like a wall next to you. The movie is all about creating illusions and making these dream feel like real life and that is what depth is all about; giving something three-dimensional space to make it feel real. When Ariadne, the main female character, starts messing with this aspect of the dreams it starts to look different. She plays with the z-axis plane first, when she moves the buildings and city from far away and makes it so they go above her and appear closer to her than they were before. These buildings in her dream also make an overlapping plane, because some buildings are covering another. The relative size of these buildings also increase when she chooses to move them because before you could not even see some of them but then they get bigger and bigger when she alters them. When the city finally is right above them they experience a height in plane with the camera from below because the camera is not shooting parallel to the ground.
The clip from Inception that I chose to talk about starts at 40 seconds. This is the part of the movie when Ariadne learns how to "build" dreams and how to make them feel like a reality. She then starts to mess with the buildings and the city and by doing this creates various depths throughout.