square, circle, triangle. This pattern is made of 3D shapes. It is a mirror pattern which means it is the same backwards as it is forwards. Starting on the left, the pattern is cube, cylinder ...

Now. 3D shapes, they have 3 dimensions. Length, width and depth. What would the 3D version of a square be? A cube. A cube has 6 square faces which are all the same size. Whereas cuboids ...