Rock Walker. Courtesy of Walker Fine Arts. Dutch printmaker M. C. Escher’s famed labyrinthine architectural visions (confusing staircase, anyone?) have become a pop-culture phenomenon that extend well beyond the confines of the art world. Nevertheless, and perhaps due to the artist’s favor among the college-dorm decorating set, Escher’s contributions have never been fully embraced by the art world proper. For decades, Rock J. Walker, a leading collector and dealer of Escher prints, has been on a mission to revamp the artist’s legacy by bringing critical analysis to his work. Walker, w...