1. Double-stroke calligraphy is a visual calligraphy art that creatively uses double strokes to produce calligraphy norms and aesthetic values. Double brush calligraphy has appreciation and skill in form, and difference and diversity in writing content.
2. Ugly book is a kind of calligraphy that feels badly written at first glance. It not only fails to show the beauty of the form and structure of Chinese characters, but deliberately distorts and vilifies this beautiful structure. Under the general aesthetic cognition, the visual feeling conveyed by this calligraphy is ugly. This kind of calligraphy that uglifies Chinese characters is called ugly book.