Hong Kong is feng shui territory. You won't notice it at first glance, but a lot is governed by this practice. It gets to the point where building heights or park locations are determined by feng shui experts' recommendations. And there have actually been feng shui wars!

The most famous showdown was between HSBC bank and Bank of China. The first built its headquarters following all the rules: mountains in the back, water in front (and the company bought up all the space from the building to the water and created a park there, making sure no one could block access to the water), no ground floor (to keep space for the wind that brings wealth). Everything was going great until the Chinese bank built right next to them.

The new building was taller. So HSBC had to add more floors. In response, the Chinese bank bought the adjacent land and built an even taller skyscraper, then installed a structure on the roof that looked like a sword pointed at their competitor. HSBC had to defend itself: they put cannons on their roof (people can't get close to them, but they're visible from the street and in photos).

This could have gone on forever, but then the Cheung Kong Centre was built between the two banks. It acted as a feng shui barrier, and the need to "fight" disappeared.