If you’re ever suspected that there must be a theoretical sweet spot where the fantasies of design nerds and transit nerds converge, this is it: Transit Authority Figures, a side project of the Massachusetts design firm Rob & Damia. TAF specializes in beautiful maps for fictional subways in places where the construction of actual subways would likely doom everyone involved — watery spots like Rehoboth/Ocean City or Cape Cod & The Islands, seen here. The maps are inspired by the iconic London Tube diagram designed by Harry Beck in 1931 and updated over the years. Originally designed as client gifts, they’re now available online. (Via Coudal Partners.)