# Materiality, parthood, and possibility **Keywords:** Lewis’ concretism - material object - parthood - possibility - mereological universalism **Abstract:** This paper offers an argument in favour of a Lewisian version of concretism that maintains both the principle of material inheritance (according to which, if all the parts of an object x are material, then x is material) and the materiality-modality link (that is, the principle that, for every x, if x is material, then x is possible).