 He goes on to point out that today the mechanism of invariance is sufficiently understood to the point that no non-physical principle ("biotonic law") is needed for its interpretation.Monod next points out that our ancestors had a history of animating objects by giving spirits to them so as to bridge the apparent gap between the living and non-living.To them, a being made sense and was understandable only through the purpose animating the being and so, if mysterious objects, such as rocks, rivers, rain, and stars, exist it must also be for a purpose (essentially there are no inanimate objects to them).