"I don't think that these maps are particularly easy to use," Roberts told Gothamist, "But they force a city into an unprecedented level of organization." Roberts is a doctor of psychology, but his interest has been in mapping and schematics for some time now. In some ways, his studies may align: the circular designs aim to provide an alternative diagram for a type of person who he believes will prefer neatness and order to geographic recognition. New York City is Roberts' latest subway redesign, the ninth in a series that began last year with the London tube map. "Every large network should always issue two maps," Roberts said. "You just can't please all people with just one design."