What makes a good Facilaitated VTS conversation?

What makes a skilled facilitator in a VTS Conversation? Is it the conditional language, the neutrality or is it the posing of the second question? I think the first two skills, neutrality and conditional language are essential but I think what drives the conversation deeper is the posing of what do you see that makes you say that? It causes the viewers to really think about and study an image to discover what were they looking at that caused them to make the statement. The probing into the deeper meaning drives the conversation to a different level. It not only challenges the viewer that made the statement but also the rest of the group to think and reflect. People sometimes criticize VTS as a simplistic posing of scripted questions, but in reality what is does is influence the viewer to look deeply and analyze their views and back it up with evidence. I was leading a conversation with a group of kindergartner  the other day and a young man stated he thought it was from the old days. When I asked him what he saw that made him say that, he said in the background are pipes (smokestacks) that are putting out a lot of smoke and dirt and they don't allow that now. What he noticed off in the background were a series of smokestacks that were emitting polluting smoke that would not be allowed today because of stricter rules. It was a small detail but he provided wonderful evidence to support his theory. His identification of the things in the background caused the group to look deeper and begin to analyze the setting as seeing the people now as factory workers on a break or possibly going to their job. They had several theories going on but many revised their statements when this small piece was revealed. It never ceases to amaze me what children see and bring to the table when they carefully analyze a work of art. I challenge you to listen carefully to conversations and think about what you would ask if you were leading the facilitation.