"Can you think of any way to run the experiment over?" The professor asked. "Do you think you can remember the formula for the plastic plate?"
Jim thought a moment, snapped his fingers and said, "By golly, I believe I've got another piece of that plastic around here somewhere. I made it up at school and had to cut a little piece off so I could get it in my suitcase. I'll see if I can find it." And stepping gingerly around the plate in the hall he came back into the room and started rummaging around in his luggage.
The professor looked at me. "Mr. Wilson, what sort of sensation did you have when you stepped on the plate?"
"Well, as near as I can remember, I don't remember," I said. "I started to reach up and pull Duchess down, and the next thing I knew my head hit the ceiling. Still got a bump big as an Easter egg."
"Did you have a giddy, light sensation?"
"No, as I say, I don't remember anything but the whack on the head."
About that time, Jim hollered, "Hey! I found it! Now maybe we can find out what goes on here."
Jim and the professor very carefully disconnected the transformer from the plate in the hall, made sure the dial settings were the same, then hooked up the new plate. It was a lot smaller than the first one, being only about six inches wide and two feet long.
"I wonder if shape has anything to do with it?" the professor mused.