His head, chest and hands strapped with body cameras, David Park deftly folded a banquet napkin the way he has thousands of times during his nine years at the five-star Lotte Hotel Seoul . Each of his motions is fed into a database that will one day teach a robot to do the same. The hotel chain is one of many companies South Korean artificial-intelligence startup RLWRLD (pronounced “real world”) is working with to create an extensive library of human expertise, harvested from skilled workers across industries, to develop AI brains for robots that could be coming to industrial sites and homes. It collects similar data from logistics workers at CJ, capturing how they grip, lift and handle goods in warehouses, and from staff at a Japanese convenience store chain Lawson, tracking how they organize food displays. The goal is to build an AI software layer that can work in robots across a range of factories and other work sites in coming years, before potentially expanding into homes.…