As for the titles of some specific titles, they are just a classification of paper, such as calligraphy, which may be slightly worse, and landscapes may be slightly better. Only manufacturers know this classification, but we can roughly distinguish good from bad through a series of methods such as price and weight. For example, if you are a beginner in calligraphy, this kind of calligraphy is definitely better than machine paper. Comparing the latter with special leather with high sandalwood content, you may think that the price is very cheap, but in fact, since it is cheap, there will not be much sandalwood.