Environmental layers

Cell stage takes place in a 2d environment, but more than one layer is shown.


 * Foreground: Contains faint visual effects for aesthetics.
 * Midground. The layer that contains the player and the other environment components that the player can interact.
 * Background. The parallax set of layers behind the player for aesthetic purposes. Contains the background images, particle effects, etc. The background color will change depending on the patch properties, like light level and temperature. It will also be dynamic.