private void OnTriggerEnter2D(Collider2D collision)
    {
        Activatable tempActivatable = collision.GetComponent <Activatable>();
        Breakable   tempBreakable   = collision.GetComponentInChildren <Breakable>();

        if (tempActivatable != null)
        {
            if (currentActivatable != null)
            {
                currentActivatable.Highlight(false);
            }
            currentActivatable = tempActivatable;
            currentActivatable.Highlight(true);
        }

        if (tempBreakable != null)
        {
            currentBreakable = tempBreakable;
            currentBreakable.Highlight(true);
        }
    }