A main example that I always think of is when classifiers are used in their conversations. When speaking a person can elaborate on what they are taking about and yes they my describe what they see, things, people, ect. but to as in depth as when a deaf person signs. When CL's, facial expressions, movement, etc. is include in the story and the scene is set up the person on the receiving end can actually picture what is happening, its not passive but active communication and it is amazing.