docs: function(mutation) {
  		Array.forEach(mutation.removedNodes, function(node) {
  			if (node.nodeType === Node.ELEMENT_NODE) {
  				gui.materialize(node);
  			}
  		}, this);
  		Array.forEach(mutation.addedNodes, function(node) {
  			if (node.nodeType === Node.ELEMENT_NODE) {
  				gui.spiritualize(node);
  			}
  		}, this);
  	}