Look up at the sky on a clear night, away from the light pollution of civilization, and you may find yourself awestruck by the natural beauty of stars and nebulae. Billions and billions of years have passed to bring them to where they are now. We have the privilege of observing but a sliver of an instant of the universe's near-everlasting grandiosity, its unfathomable scale, its chaos and serenity.
...now take that night sky and mold it into a humanoid that can force you to feel that same sense of wonder or any other emotion just by looking deep into their eyes. That's a Cosm.