Paying attention to a representation -- or not

An interesting photo and comment from Eugene Eric Kim about participant attention (or the lack of it) in a graphic facilitation session. Of course the photo depicts just one moment out of a session that might have had periods of direct participant engagement, but it's a good illustration of the main questions I am trying to get at with the research:

• What (and when, and how, and why) does a practitioner do to promote engagement with the representation?
• How do they make it of value to the participants?
• What makes the difference between something that (however virtuosic) is just background to the main discourse, and something that is (or becomes) integral?