In an effort to better understand what makes a numerical method mimetic we consider an exceptional case. The Keller-Box scheme is multi-symplectic (Reich 2000), it always propagates waves in the correct direction (Frank, 2006), and it discretizes the problem physics and calculus exactly (mimetic). However, the method is not easily described by algebraic topology or discrete differential forms. The properties of this unusual mimetic method are discussed and compared to the more classical mimetic finite element and finite volume methods.