Nature Yin Yang - Wooden Jigsaw Puzzle – PuzzlesUp
logical deduction - Another Yin Yang puzzle! Part two - Puzzling Stack Exchange
Amazon.com: Bits and Pieces - Black/Silver Yin and Yang Metal Brainteaser Puzzle-Metal Puzzle Brainteaser, Nickel-Plated - Measures 2-1/2" in Diameter : Toys & Games