One of the pre-requisite for a Feng shui consultancy job is to determine the Facing of a property. Most Feng shui formula requires to first to establish this unless one follows the Black Hat School.
Different schools uses different criteria to establish this but they all agree on this same criteria and that is the Yang Side. Yang here means the opposite of Yin.
Yang can be defined as Brightness, Man is Yang, Noise, Light, Movement and so forth.
Yin on the other hand is the opposite thus it means Darkness, Female, Silence, Heavy, Stillness and so forth.
The difference between schools of Feng shui is the individual interpretation of which side of the building is considered the Most Yang. Some schools may add a few sub criteria to further define Yang.
It is difficult for students of this method to define a round or oval shaped building.