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 blur setting controls how strong the blur is at the top and bottom, leaving a sharp horizontal band in focus across the middle. The gradient blur controls how gradually the image goes from sharp to blurry: small values give an abrupt transition, large values a smooth one.
Note
This effect only works on 2D layers and objects.
Reference
All effects are listed in the effects reference page.