What is the history of Chinese brush calligraphy?

A calligraphy brush looks simple, but once the Chinese brush or Japanese brush starts to move its tip, its expression reaches beyond the limits of the paper. The calligraphy brush goes up, goes down, it bends; with more pressure it spreads, with less it regains its shape, and for each movement the calligrapher has to have the calligraphy brush under control and be able to return to a straightened brush tip.