The image you see to the left was taken back in July 1931 at a secretarial school in the US. The large phone dial you see is actually a fully working telephone, hooked up to a loudspeaker. The point being when the instructor was demonstrating the phone the class could see clearly how to use it and also hear the noises a phone should make whilst it connects.
Things don’t change much and we still advocate the use of props in workshops and training sessions, firstly because they are something tangible and hopefully fun and secondly why tell your class about something when you can just show them?
Also a prop is a great talking point, I recently went to a networking event and took a video camera with me which seemed to help gravitate people towards me.
Original story and image from BoingBoing.