Blue and white is a common colour combination in the tile work. This pattern can appear quite jumbled and like a random scattering of squares. But when you squint you can see perfectly shaped diamonds. It has many different dimensions, as have the majority of the Islamic patterns.
On a recent trip around Morocco, by train and bus between the cities of Casablanca, Rabat, Fes and Marrakech, I was fascinated by the continuous mesmerising pattern everywhere I went.