The most unique bonsai of bougainvillea

This is the most unique bougainvillea bonsai tree. Age of more than 30 years. Is unique because there are two trunks in a tree. The overall shape of this tree is very interesting and unique. I never see any of this kind of shape. How is it formed? Ask this tree? There are bonsai enthusiasts that offers an attractive price, but I still have not decided to sell. Only a few of my friends who have seen this tree and it never compete in any of bonsai competition.