Many artists have their own mediums that they prefer. Many artists are painters, and some artists prefer to carve wood. There are artists who work with glass, and artists who prefer clay.
No matter their skill set, artists can always learn a new way to create. They often do this because it enhances their creativity. An artist who works with wood often cuts down their pieces. If they learn how to do pottery, they will learn to judge the correct amount of clay to use for the size piece they need. Their artistry in woodworking can be enhanced by this knowledge. Of course, they will certainly never look at another piece of pottery quite the same either. They will now understand what goes into the making of an artistically thrown and decorated pot.