It ranges from the simple and vulgar to the complex and artistic; some is detailed and textual, while some is purely symbols and images. It can be direct, expressing the views of the artist, and it can be like moon language, a pile of abstract symbols.
從簡單、粗獷，到繁複、精緻；可以是有文本的，亦可以是純圖像、純視覺的；有的直接告訴你它的信仰，有的彷彿是火星文，留下一串問號。