A picture was proposed:
Four sub-lunar elements (fire, water, air, earth)
or Forms comprise all matter.
The same reason is given for the growth and decay
of human beings and other living things.
The sun, moon, planets, and stars are affixed to
crystal nested spheres.
The four Forms influence the motion of the spheres, but the matter (the sphere's contents) affect the Forms.
Were these really seen literally?