Chinese art best unframed if hung freely (4,4)
I believe the answer is:
feng shui
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for feng shui that I've seen before include "Chinese system of energy flows" , "guide to oriental building" , "Chinese principles of the flow of energy in buildings" , "Chinese values" , "rule for building" .)