Patterns in squares

Thank you Clara for putting some maths onto the blog! Square numbers!

We had a look at patterns of squares using Cuisenaire rods.

At first it wasn't so simple. We were getting a lot of almost squares. Look at this one, created on the Cuisenaire Environment -

At first it fooled a lot of us! Can you see why it's not a square?

Not all of them are square numbers, but a lot of interesting patterns emerged worth following up.

Can you think of a mathematical question about one of these shapes?