Collectible figurine of a tortoise or a turtle is believed to bring good luck to any house in Feng Shui and Vaastu belief systems. Made of pure brass with the magic numbers grid on its belly underneath. Lo Shu Square or the Nine Halls Diagram is the unique normal magic square of order three (every normal magic square of order three is obtained from the Lo Shu by rotation or reflection). Lo Shu is part of the legacy of the most ancient Chinese mathematical and divinatory traditions, and is an important emblem in Feng Shui, the art of geomancy concerned with the placement of objects in relation to the flow of qi "natural energy".