Why nature made a choice of Clifford and not Grassmann coordinates?

URN:NBN:SI:doc-8G7OE2F72018Mankoč Borštnik, NormaNielsen, Holger B.documents/doc/8/URN_NBN_SI_doc-8G7OE2F7_001.pdfdocuments/doc/8/URN_NBN_SI_doc-8G7OE2F7_001.txt192articlestr. 175-2151580-49923284068URN:NBN:SI:doc-8G7OE2F7engBlejske delavnice iz fizikeInCfizika osnovnih delcevonkraj standardnega modelateorije Kaluza-KleinWhy nature made a choice of Clifford and not Grassmann coordinates?