Altman was originally a human being, or a person who was leading a planet, but his appearance and habits were not much different from those of human beings, and then he was irradiated by the plasma solar tower and mutated into Altman.

But Altman can be changed back into a human, that is, the original human form. But Altman lives in the country of light, and gradually everyone will not become a human form all his life, so he lives with a huge Altman body. Those Altmen who came to the earth, because they want to use human form, have not changed their human form much when they were in the country of light. Anyway, the people in the country of light look almost the same as the people on earth, so they use the appearance of the human body on the earth as their own Altman human form.

In this case, it's easy to have a baby, become human, get pregnant and give birth. But this is an extremely old practice, and people probably gave birth to children like this when the plasma solar tower was just built.

Later, the Altmen used mating light with each other. According to a record in Yuangu, there are some buildings in the country of light that perform this function. For example, Taylor was born in the tower of Otto (not the one that was pulled down by 882 in Leo). There is something similar to a melting pot. The father releases some energy (and genetic information) into it, and the mother releases some energy (and genetic information) into it. There is a light on it (it is said that the energy comes from the plasma spark tower), and according to it, the glass cover (embarrassing) is broken out.