 The spheres move eternally in majestic circles simply because it befits their lofty existence to do so (EpiMeta 4.152 {140}, LongMeta XII.36 {1595}, Incoherence I.15 {484}), but these motions have a subordinate effect of signal importance to us: they sustain the very existence of our sublunary world. Most basically, the motion of the celestial spheres—although they are not themselves hot (SubstOrb 2.95)—gives rise to heat in the fiery region immediately beneath the lunar sphere, and from heat and its contrary, cold, arise the four elements: earth, air, fire, water. “The existence of the celestial body entails necessarily the existence of the elements … as preserving, efficient, formal, and final cause” (EpiMeta 4.171 {161}; Incoherence I.3 {261}). The bodies that furnish our sublunary realm are various elemental mixtures, in which the elements themselves endure in an attenuated state, as the material strata above prime matter (EpiMeta 1.48 {32}; LongCaelo III.67; EpiGC I.121 {22–3}; see Maier 1982 ch. 6). The qualities of these elements—hot, cold, wet, dry—“are the causes of all natural things that come into being and pass away” (Incoherence II.1 {525}). The entire system so depends on the celestial spheres that “if the motion of the heavens were destroyed, … the world in its totality would be destroyed” (SubstOrb 4.117; Kashf 5.112 {191}).