Psychogeography is the act of exploring an urban environment with an emphasis on curiosity and drifting. Or, more colloquially put, a “toy box full of playful, inventive strategies for exploring cities.” For the Brooklyn-based artist Dustin Yellin, his toy box is full of everything he finds on the street—flowers, leaves, bugs, and even dead rats, which are then composed into three-dimensional collages and sealed behind resin. In his most recent series “Psychogeographies,” Yellin uses…