The design of the arklets, and of the whole Cloud Ark system, kept changing. One day it was all about being "fully distributed," which meant that in the long run there was no central depot—no Izzy—and that all exchanges of material and "human resources" between arklets would happen through "opportunistic docking," meaning that two arklets would agree to come together and connect nose-to-nose for a time so that food, water, vitamins, or people could be exchanged. This was envisioned as market driven, without any central command and control mechanism.