To give a context to my wondering, I would like to look at an play episode around a very simple apparatus comprised of two sensory tables connected by a wooden tray.
Not only is the apparatus simple, but so are the material provisions. The tables and tray contain only white sand and glass gems for this play episode.
After about ten minutes, the children have all coalesced around the small sensory table. Since I am across the room, I do not know what has happened to bring them all together for a joint endeavor.