  Before the twentieth century, people were able to view moving pictures. Those moving pictures were then named films. At about the same time, films were actually very short. Subjects usually included views of a couple of people having breakfast. A kid playing with a banana, a man doing exercises, a pig eating an egg, or even just several houses, all very simple ideas. In other words, the early films were extremely physical and casual. Then people started expressing their feelings, nervous or anxious, and their thoughts in films. Later conversation and interview showed up in films. People call those films documentary. With the diversity of contents, it appeared genres, but few films lasted more than an hour.

Alan Hsueh