The question about door-tilting in FS keeps coming up, usually it gets 3 kinds of anwers: 1) It works. 2) It doesn’t. 3) It depends on what method you use, then there is the rhetorical reply, “You tell me!”. So here is my take on the subject:
If by feng shui you mean the quality of the environment then tilting the door by a few degrees has miniaml effect on the feng shui or the quality of the environment, instead it would make the door look very strange and visitors who try to use the door would ask, “What is going on here, why this funny-looking door?”.
If by Feng Shui you mean some schools of thought using door tilting to correlate the door facing to a different Herxagram with a different meaning, then the tilting would match the world-view of the user and would “tilt” his or her perception of the formless and it would make the user feel that the fortune of the place has changed. Now that could have an effect since the perception or the mind-set has changed in the user’s view.
There is “body” FS and “mind” FS, and there is also “form” FS and “compass” FS, it could get confusing if we are not aware of the difference.
The attached picture shows Joao Carlos Borges, a FS practitioner from Portugal doing his thing and asking this question in his Feng Shui Forum on Facebook.