When Zoloa kicked open the front door, his father was staggering around. He must have been using a small amount of ethanol, one of the few substances permitted under Dyson's principles to yield mental effects.
According to Dyson's rules, quotas were based on the weight of an individual's remaining biological body. The higher the rate of body modification, the greater the proportion of the brain in the "remaining biological body weight," and the stronger the mental effects of the ethanol.
It was said that some people were so desperate to get more ethanol that they would increase their modification rate at all costs—even if it meant getting some unnecessary, cheap modifications.
Zoloa's father hadn't reached that stage yet, but he still loved ethanol, particularly enjoying consuming his daily quota all at once within a short time.
As a skilled worker, the prosthetic limbs he possessed were more cumbersome than those of others.