Since the chemical space of a set of compounds is not unique and will depend on the set of descriptors chosen to describe it, there are possible multiple chemical spaces that are theoretically possible for the same data set. Continuing this line of thinking, a chemical multiverse was proposed recently and defined as "the group of numerical vectors that describe differently the same set of molecules." An alternative definition of the chemical multiverse is a "group of multiple chemical spaces, each one defined by a given set of descriptors -a group of "descriptor universes" . The chemical multiverse concept is represented in Figure .