  In this article we present a method for constructing two-point functions in
the spirit of the hexagon proposal, which leads us to propose a "square form
factor". Since cutting the square gives us two squares, we can write a
consistency condition that heavily constrains such form factors. In particular,
we are able to use this constraint to reconstruct the Gaudin through the forest
expansion of the determinant appearing in its definition. We also use this
procedure to compute the norm of off-shell Bethe states for some simple cases.
