It there a true opposite of Yin and Yang, I don't have the answer, but it may look something like this ball marker. The marker features live Yin and Yang Koi on one side and skeleton Yin and Yang Koi on the other side . Machined from naval grade brass, this 1.25” ball marker features a satin finish with deep engravings. Also a small Kraken logo on the edge.   

• 1.25" diameter
• 1/8" thick
• Weight = 20g
• Naval grade brass
• Gift box included 

Please note that some metals patina over time. This will provide your item with a more unique look as it ages!