The muscular simplicity of the sharp line work and the playful character design in “Robot Dreams” mimics the ligne claire graphic style first popularized in the first half of the 20th century by Belgian cartoonist Hergé, best known for creating “The Adventures of Tintin.” Faithful to Varon’s work, Berger’s animated effort preserves the vivid solid colors without much shading and the visual business of the intricate production design, which captures the sensory overload of the city and earns it a spot among the great New York movies.