Not so extreme as a birds eye view. The camera is elevated above theaction using a crane to give a general overview. High angles make theobject photographed seem smaller, and less significant (or scary). Theobject or character often gets swallowed up by their setting - theybecome part of a wider picture.
These increase height (useful for short actorslike Tom Cruise or James McAvoy) and give asense of speeded motion. Low angles help givea sense of confusion to a viewer, ofpowerlessness within the action of a scene. Thebackground of a low angle shot will tend to bejust sky or ceiling, the lack of detail about thesetting adding to the disorientation of theviewer. The added height of the object maymake it inspire fear and insecurity in the viewer,who is psychologically dominated by the figureon the screen.
A camera angle which is deliberately slanted to one side,sometimes used for dramatic effect to help portrayunease, disorientation, frantic or desperate action,intoxication, madness, etc.