title: How do you add a CIPixellate Core Image Filter to a Sprite Kit scene?
body: <p>How do you add a CIPixellate Core Image Filter to a Sprite Kit scene?</p>
  
  <p>I have a SpriteKit scene that is an SKScene or subclass of it.
  I want to add a Core Image filter to the scene. Specifically a CIPixellate filter, so I can have 8-bit game heaven for free.</p>
  
  <p>How do I do that?</p>