What is Animation...?
Animation is a graphic representation of drawings to show movement within those drawings. A series of drawings are linked together and usually photographed by a camera. The drawings have been slightly changed between individualized frames so when they are played back in rapid succession (24 frames per second) there appears to be seamless movement within the drawings. Pioneers of animation include Winsor McCay of the United States and Emile Cohl and Georges Melies of France. Some consider McCay's Sinking of the Lusitania from 1918 as the first animated feature film.
What is Arena...?
Early animations, which started appearing before 1910, consisted of simple drawings photographed one at a time. It was extremely labor intensive as there were literally hundreds of drawings per minute of film. The development of celluloid around 1913 quickly made animation easier to manage. Instead of numerous drawings, the animator now could make a complex background and/or foreground and sandwich moving characters in between several other pieces of celluloid, which is transparent except for where drawings are painted on it. This made it unnecessary to repeatedly draw the background as it remained static and only the characters moved. It also created an illusion of depth