Double forms
Most forms have the same words across and down. Forms whose across words are different from the down words are called double forms. When a square, for example, has different words across and down, it is termed a double square. (Forms that inherently have different words across and down, such as pyramids, are not labelled double.) Double forms are harder to create than standard forms. See the examples in the diamond and square descriptions; other shapes shown in this Guide as single can also be constructed as double.