Our bodies are at the midpoint of all possible sizes

There is a smallest and a largest size in our universe.

The smallest size allowed by physics is the Planck Length (10^-33 centimeters), at which quantum gravity is supposed to become important and the largest size is simply the diameter of the universe.

That spectrum of sizes therefore spans...

• size of the cosmic horizon
• size of a supercluster of galaxies
• size of a galaxy
• size of the distance to Orion Nebular
• size of the solar system
• size of the earth
• size of a mountain
• size of a human
• size of an ant
• size of a bacterium
• size of a DNA
• size of an atom
• size of a nucleus of an atom

and even smaller...

• the weak interactions
• the massive dark matter
• the grand unified theory (GUT)
• the Planck Length

(Picture of Cosmic Uroboros from new-universe.org)

 

Among those sizes, our position as human beings is central. If we would be much smaller, we woundn't have enough atoms to make up our complex consciousness. If we would be much bigger, the speed of light would inhibit communications. It is exactly the central size that can produce a brain.