Zen is a school of Mahayana Buddhism that originated in China during the Tang dynasty as the Chan Buddhism and later developed into various schools. It was strongly influenced by Taoist philosophy, especially Neo-Daoist thought, and developed as a distinct school of Chinese Buddhism. Therefore, it is none of the first 3 listed options.
The animator, Windsor McCay use "heavy lines" to define a character from all other drawing pieces whether it was background or other characters. (he just outlined his stuff with a thick, black pen)
