This pratice originated in the early days where scholars would mingle with the potters and have their artistic work expressed on Yixing ware. In this way, their works could pass down in history. The Yixing ware such as teapots also acted as a medium where such works could pass down as a legacy. The pots themselves also become valuable because of such works on them.
I spotted this giant teapot sitting in a corner of an antique shop in the early 1990s. The teapot was full of calligraphic work inscribed on both sides of the pot. After some bargaining, i bought the giant teapot and took it home for display purpose. You can never fill up the teapot to make tea. It is just too huge for this purpose. Unless you need to quench the thirst of an army of tea drinkers.
|Giant pot with master's calligraphic work|
Due to scarcity in the Yixing zisha, such giant teapots are not normally made these days as it is quite a waste of raw material.