private void Update()
 {
     if (Input.GetKeyDown(KeyCode.LeftControl))
     {
         SpellGridNode.expand();
     }
 }
        // Use this for initialization
        void Start()
        {
            instance    = this;
            initialNode = SpellGridNode.createNode(0, 0);

            SpellGridNode.expand();//1
            //SpellGridNode.expand();//20
            //SpellGridNode.expand();//40
            //SpellGridNode.expand();//80
            //SpellGridNode.expand();//40
            //SpellGridNode.expand();//80
        }