  We analyze a large set of modular invariant models of lepton masses and
mixing angles, pointing out that many of them prefer to live close to the
self-dual point $\tau=i$. We show that in the vicinity of this point a
universal behavior naturally emerges, independently from details of the theory
such as the finite modular group acting on the lepton multiplets, the weights
of the matter multiplets and even the form of the kinetic terms, which are not
required to be neither minimal nor flavour blind. The neutrino mass spectrum is
normally ordered and universal relations describe the scaling of the physical
observables in terms of the parameter $|\tau-i|$.
