code: function(spirits) {
  		if (gui.hasModule("gui-layout@wunderbyte.com")) {
  			gui.DOMPlugin.group(spirits).forEach(function(spirit) {
  				gui.VisibilityPlugin.$init(spirit);
  			}, this);
  		}
  	}
docs: Evaluate spirits visibility.
  @todo: Off to plugin somehow.
  @todo: Test for this stuff.
  @param {Array<gui.Spirit>}