Here is a picture of the pulser model in action. It is 2 pics side by side (one with a pulse going out the top) and I am sorry about the quality. I thought black and white might be good. The people at OUR eco village will probably set up their model far better with the explainatory notes beside and I will get a pic of that one to replace this pic.
Hope it helps you with visualization anyway. The model can be nailed to  or hung from a wall with the paperwork beside it to easily explain what is going on.
Brian white