Hi, Dr. Meers,
In my work there in one key location, namely the demo station, as demonstration comprises about the first one and a half hours of each 5-3/4 hour class. But you raise a good point about how our position in the room or, for example, sitting vs. standing, sends certain signals.
Even though I might appear "confined" to that demo station, I can always carry product, or a component of a product, around to let students see, smell, and sense the textures at a certain juncture. This lets them feel welcome, draws them in and lets them know I want them involved. By the same token I can invite them to leave their chairs and file through the demo area to see something in progress. Among other things this will break up the long demo period and reinvigorate learners.