If I may counterject here Oz, subspace is so completely different then dissassociation, I have experienced both in BDSM. Dissassociation is a thick white fog, nothing enters once this has descended, a person blanks out completely and remembers/feels nothing whereas subspace is softer. a cloud, and the sub/slave is aware of sensation, carried, lead or taken by this.
from the view of a submissive, I am not sure how it would look from a Dominants point of view or sight.