My current interest is on gravitational entropy in the case of Petrov type D spacetimes. The Gregoris and Ong proposal in the case of LRS Bianchi type I spacetimes is my current interest, where the spacetime has local rotational symmetry and is of Petrov type D, i.e. the spacetime has a non-zero Weyl scalar $\Psi _{2}$ and we use the Cartan invariant to describe gravitational entropy.