Unit 3: Task 2


I was told that many years ago, the symbol of the fish was used to let Christians gauge whether they were safe or not. When a new person approached a group, someone would make an arc on the ground with their foot near the new person. The new person would either ignore the arc, or draw an arc intercepting their arc, thus making a fish shape. The arc would seem irrelevant to anyone not knowing the fish key. The arc made a statement about the person’s faith to people who knew the code but meant nothing to those who didn’t. Students could learn the importance of knowing keys to codes using this story as a beginning. Perhaps the lesson could have the students use the arc symbol and the teacher could complete it into a fish only when they have said the correct number or code word to complete a class encrypted message.

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