Comics historian Les Daniels wrote that Sprang's "clean line and bold sense of design" set him apart as "the supreme stylist" of the early Batman artists. Sprang used to study the way children read comics in order to experiment with page layouts and panel to panel transitions, hoping to create "the most suspense and the most fluidity to keep the pages turning". Daniels singles out Sprang's work on the 1948 debut of the Riddler as "a superb example of story breakdown and page design". The tardiness of Sprang's friend and frequent collaborator Bill Finger sometimes produced situations in which he would have to send in pencils for a story before the ending had been written, actions that "required some careful figuring". In "Batman #34", "Sprang drew Batman and Robin capering across...Mount Rushmore", over a decade before Alfred Hitchcock filmed a similar scene in North by Northwest. One story drawn by Sprang, "Joker's Millions", was adapted into an episode of "".