 These are the earliest known cartoon shorts.In 1926 the four Wan brothers, Wan Laiming, Wan Guchan，Wan Chaochen and Wan Dihuan worked under the Great Wall Film Company in China, not to be confused with Great Wall Movie Enterprises Ltd. Wan Laiming and Wan Guchan were then recognized as China's animation pioneers when they produced the first animation short "Uproar in the Studio" running 10 to 12 minutes long in black and white.The brothers believed that Chinese animation should be instructive, logical and thought-provoking besides being entertaining to its audience.