  The introduction of a modulus z(K), analogous to u=<tr phi^2> in the N=2 SUSY
SU(2) gauge theory solved by Seiberg and Witten, and whose defining property is
the invariance under the symmetry and duality transformations of the effective
coupling K, reveals an intriguing correspondence between the D=2 Ising and
Potts models on the square lattice. The moduli spaces of both models, the
spaces of inequivalent effective temperatures K, correspond to a
three-punctured sphere M_3=P^1(C)\{z=+1,-1,\infty}. Furthermore, in both
models, the locus of Fisher zeroes is given by the segment joining z_c=-1 to
z_c=+1.
