In the critical limit, connectivities of clusters have the same behaviour under conformal transformations as correlation functions of the spin operator. Nevertheless, connectivities do not coincide with spin correlation functions: for example, the three-point connectivity does not vanish, while ⟨ ⟨ σ σ σ σ σ σ ⟩ ⟩ = 0 . There are four independent four-point connectivities, and their sum coincides with ⟨ ⟨ σ σ σ σ σ σ σ σ ⟩ ⟩ . Other combinations of four-point connectivities are not known analytically. In particular they are not related to correlation functions of the minimal model, although they are related to the q → → 2 limit of spin correlators in the q -state Potts model.