Or how we figure out who you are and you figure out who I am.
One way is to make photographs. Another is sentience, but that requires desire and skill, and a decision as to how it should be used.
Science has changed the world for relationships, yet few know what it has discovered. It is more fundamental than religion sinde it is based on science and the human mind. Racism, in particular, takes on a whole different aspect, providing we have the character and course to use it.
I suspect that many will not believe this but genetics and archology have discovered the fundamental development of races.
First and foremost, we are all Africans having migrated in various relatively small groups from central Africa some 50 to 100 thousand years ago.
Our skin color is primarily determined where our ancestors settled and the sun’s role in creating vitamin D. If the sun is intense, such as at the equator, the skin must be protedted with the pigment melinin. However, as the warm season shortens with moves north and the sun is lower in the sky over time the skin lightens. Such is white supremacy.
However, through mutation and other adaptations to the environment, homo sapiens may take on other differences in appearance.
We are apparently left with tribes fearing each other, adopting differnet religions and other patterns of behavoir that have never left us. American started two devestating wars in the 20th century that can only be explained by tribalism from the time of huter gathers.
The preoccupation with tribal rivalry is the bain of human relations.
I choose to operate under the assumption that as the light of sentience, consciousness, and intelligence develop, a more human civilation will evolve, providing we have not redndered the planet uninhabitable.