Just as one cannot have something "long" without having something "short" for comparison, one cannot have an "object" without a "void". It is the void that interests me. With this kind of priority I find that I must use objects that have little or no emotional association. Negative space is fragile if one wants to use it as the primary "subject matter" of a painting. Any object depicted that has significant emotional associations will tend to dominate (which is exactly what I don't want to happen). The objects are not there to be described; they are there to explain the space. I don't limit myself all the time, though, and, once in a while, I do use loaded subject matter.