Framing

This photo is showing a house but the small hole gives you a narrow perspective as to what you're looking at form a distance.

This photo also shows many frames that allows different parts of the photo to be shown. It gives an interesting point of view.

This photo also uses another natural frame and look pretty cool. It shows the darkness of one view looking towards the bright and amazing city.

This photo seems to be an example of one that needs a frame and doesn't use one. It would give the photo more of  an interesting and cool view.

This photo is a prime example of what pictures with a natural frame could look like.