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?
Reference
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