  A representation formula for the solution of the $\infty$-Laplace equation is
constructed in a punctured square, the prescribed boundary values being $u=0$
on the sides and $u=1$ at the centre. This so-called $\infty$-potential is
obtained with a hodograph method. The heat equation is used and one of Jacobi's
Theta functions appears. The formula disproves a conjecture.
