Dr Michael Mak, from the University of Newcastle in Australia, studies how feng shui can be used in urban design and architecture from what he calls a scientific stand point.
De-cluttering it seems (with or without Feng Shui) can be a process of letting go of things that have been holding you back or distracting you from your current life.
If you believe that an advertising space is an environment, if you read up on it, you can apply the principles of Feng Shui in six key areas of advertising (I have applied these principles below liberally rather than scientifically).