Given a closed-subscheme (corresponding to the homogeneous ideal $I$  inside $K[x_0,...,x_n]$) of a projective scheme $\mathbb{P}^n$, how can one find out the blow up using Macaulay2? `Proj(reesAlgebra(I))` gives the blow-up of $I$ along with an affine scheme. Is there any function that we can use? Or we need to do something else?