Tilt shift effect
Add blur to the top and bottom of the entire layer or object. Perfect to simulate a tiny world or a camera focus effect.

The middle of the screen stays sharp while the top and bottom become blurred. The Blur setting controls how strong the blur is, and the Gradient blur controls how wide the sharp band in the middle is (a smaller value keeps only a thin strip in focus).
Reference
All effects are listed in the effects reference page.