Here’s a journey into codes and cryptography. Have you ever started with a shape and kept adding additional shapes? What happens when you do?
The NRICH website publishes free mathematics resources designed to challenge, engage and develop the mathematical thinking of students aged 5 to 19. NRICH also offers support for teachers by publishing Teachers’ Resources for use in the classroom.
This task can be found at: https://nrich.maths.org/7810