Negative Space is what is NOT the focus.  Negative Space is particularly useful in optimizing not only product, service and  campaign delivery, but also workplace productivity and overall satisfaction.   Recognizing and optimizing Negative Space opportunities can improve internal processes as well as end products and campaigns. 
​
Negative Space is:
                                            * PHYSICAL.  The measurable space around, between and amidst;
                                            * DURATIONAL.  The measurable time in a specified period not used;
                                            *PERCEPTIONAL.  The emotional expectation, what didn't happen, what wasn't good.

​Finding Negative Space requires defining the context and boundaries.  Once this tightly defined area is optimized for its Negative Space, the boundaries or context can expand.  Context is crucial, otherwise your negative space goes on forever.  
​
Consider the physical, aural and emotional negative space.  What is not done?  What is not said?  How can you optimize this space?

Recommended Reading: MC Escher Graphic Work, Microinteractions: Designing With Details