… having studied one subject, we immediately have a great deal of direct and precise knowledge … of another.
Feynman referred to different phenomena that can be described by equations of the same appearance: Learning how to calculate the distribution of electrical charges gives you the skills to simulate also the flow of heat.
But I extend this to even more down-to-earth analogies – such as the design of a carton of frozen herbs resembling our water-tight underground tank.
No, just being a container for frozen stuff is too obvious a connection!
Maybe it is the reclosable lid covering part of the top surface?
No, too obvious again!
Or it is the intriguing ice structures that grow on the surface: in opened frozen herb boxes long forgotten in the refrigerator – or on a gigantic ice cube in your tank:
The box of herbs only reveals its secret when dismantled carefully. The Chief Engineer minimizes its volume as a dedicated waste separating citizen:
… not just tramping it down. He removes the flaps glued to the corners:
And there is was,
plain plane and simple:
The Chief Engineer had used exactly this folding technique to cover the walls and floor of the former root cellar with a single piece of pond liner – avoiding to cut and glue the plastic sheet.