A baby perceives little more than itself. Ego fills its universe.
A toddler notices its caretakers. The universe contains ego and family.
Children learn that other families exist. The universe contains ego, family, and their culture.
A child learns that other cultures exist. Everyone belongs to the human family.
A child learns that non-humans exist. Humans are just one species of animal.
A child learns that non-animal life exists. Animals are one expression of life.
A child learns that other planets exist. Earth is just one orbiting the sun.
A child learns that other suns exist. Our sun is one among billions in our galaxy.
We know that other galaxies exist. Ours is one among trillions of galaxies.