This Alberti Disk is a great code making tool. Have students all work together to create exact clones so they can write coded messages to one another.
We are currently reading a book on codes throughout history and my students were really engaged when they were able to make their own!
Print on card for best results.
You will also need a split pin for each so the centre circle can spin.
FNUC WNL CHRNW GK (Solve the code!)