Figure 1 Illustration: Alan Stonebraker  Figure 1: Fermions on
the random-hopping chain. Instead of moving freely throughout
the chain, fermions are confined to pairs of sites (connected by
the arcs), which are often nearest neighbors, but can also be
very far apart. The pair formation is scale invariant: if we
zoom out, and only draw sites that are separated by a distance
matching our new reduced resolution, the localization pattern
looks the same.