This first example is Figure-Ground, teaser movie posters from Black Swan.  The figure of the ballet dancer’s arms can be in focus alternately with the feathers of the swan.

Figure-Ground Example, Black Swan

[Credit: http://site.laboca.co.uk/Black-Swan]

The second example is Simplicity, with the iconic movie poster from Silence of the Lambs.  Simplicity is the mind’s perception making an immediate and simple interpretation. Here, the “skull” of the Death Head’s moth in the poster is actually made up from the form of women, an image taken from an old Salvador Dali image.

Simplicity example of Gestalt, Silence of the Lambs

  Simplicity – Silence of the Lambs

[Credit: http://dontpanic-marci.blogspot.com/2010/11/gestalt-psychology.html]