Perspective is Looking at objects in a different way, and using the object/subject differently. Most Perspective Photography is using Landmarks, Building, Nature as an object to lean against, Squeeze, Blow, Pull, Stamp, And many more ways. This type of photography makes the object that is normally vey big look like the smaller object. For example the leaning tower bellow is actually a big powerful building, but take a photography from a distance and put a person relatively close to the camera and it make it look like the person is holding the tower up.
I really like the photo on the top left as it is unusual and goes an extra step, Making it look like guy is blowing them off his hand.