Metal ring puzzle----Fantastic five

To compare the two metal ring puzzles which you find in this video, you will find that they are alike "functunally". One technique of problem solving is to check in our brian(mind) whether we have solved a similar problem. One term is also meaningful here. "Analogy" is among the thinking skill or strategy, which concerns about not only problem solving but also inventions and innovations.. Therefore this is a sample lesson to show such problem solving technique 解難、發明與創造，不時都會用得着「類比」這個思維技巧的。 .