This object lesson requires a magifying glass, a sunny day , a piece of paper, and just a regular piece of glass. Take your class or family outside and give one person the magnifying glass and another person the normal glass. See who can burn a hole in the paper. The lesson could take many direction after this:
In order to get quickly to the heart of a problem with a solution, you have to have concentrated effort, or;
Magnifying your calling means giving real concentration and the result is magified power, or;
Look what unusual powers glass can have when it is concentrated in that one spot . That is what can happen when a group works together to solve a problem. If they are all working together. If its not a concentrated effort, then there is no power, or,
you think of something else........