The air hummed oddly, setting her teeth on edge. She was amazed to discover that she could actually feel the Veil shifting, though she wasn't sure exactly how she was feeling it. There was a sense of motion, and a rippling in the magical field. Princess Celestia had another dozen unicorns in Ponyville casting a very similar spell, and she could feel a hint of her teacher's familiar magic as the Veil moved. 