User blog comment:DYBAD/Character Sheet/@comment-4867780-20160912105329/@comment-4867780-20160913080029

The Possibility Matrix is entirely made of 100% real data (the templates Lawrence uses to construct physical objects and beings), so the experience is completely identical to reality, allowing them to share as much quality time as needed without interfering with their lives.

More traditional meetings are possible as well, though they remain optional, it's more of a case by case thing depending on their individual circumstances (it's especially true for children born outside of Selforge like Maelys - they have their own story after all).

Selforge citizens are Lawrence's chosen companions he invited to Selforge City and the children born from them (refered to as "legitimate" due to the parents' mariage-like relation).

Children living in the Middle Realms are born from short-term affairs and casual enjoyment during his adventures (thus refered to as "natural"), with a wide diversity of partners who ultimately aren't really citizen materials.

The Middle Realms are essentially Lawrence's version of child support, taking responsibility when their mothers' circumstances are unfavorable, by providing them with a happy life in a beautiful world in place of classical money.

Both legitimate and natural children are absolute immortals thanks to the Selforge Essence they inherited from him, but it is less obvious outside of Selforge to preserve their lifestyle.