Direct Neural Programming had been the dream of many education "reformists" and technocrats. The perfect way to teach skills, divorced almost completely from the requirement that human teach human. One single avatar of a skill could be used to propagate that skill until it became obsolete. Billions were poured into its development and marketing, thirsted for by corporations, the military, and politicians, each group wanting the surface and the sinister. But it was not to be.
The Chinese, when attacking a castle or fort, flew kites over the city wall and used the length of string it took to get it there as a measurement to know how far they had to dig a tunnel to get under the wall.