Macrocosm: the harmonious order of the natural Universe.
Mesocosm: the harmonious order reflected in the organization of society, in art, architecture, music, and sacred objects made by people.
Microcosm: the harmonious order of the Macrocosm reflected in miniature within the human being.
These explanations were provided by Michael S. Schneider in his DVD A Journey From 1 to 12 which is one of my prized possessions! It’s either a great companion to or a decent substitute for his wonderful book, A Beginner’s Guide to Constructing the Universe (which I highly recommend).
