The p5.createQuadrille method is a polymorphic function that generates a quadrille object. Each cell in a quadrille can hold any valid JavaScript value, such as numbers, strings, arrays, objects, functions, or null (representing an empty cell), including p5-specific types like p5.Color, p5.Image, and p5.Graphics. If a cell is created with an undefined value, it is automatically converted to null to ensure consistency.

The p5.createQuadrille function enforces a key invariant: the created quadrille remains a square, matrix-like structure where all rows have the same number of columns, and empty cells are consistently represented as null. Drawing a quadrille will be covered separately in another chapter.