Sculpture is to carve the three-dimensional lines under a plane object with strokes. On the lettering side, the font or pattern is hollowed out, leaving only the part outside the font.
Male engraving refers to convex shape, which is a three-dimensional line that displays strokes on a plane object, leaving the font or pattern itself and engraving all the rest.
Lettering is mainly divided into traditional lettering and modern lettering. The former is mainly manifested in the carving, reproduction and reproduction of the charm of calligraphy, and it is also the re-creation of calligraphy, which makes calligraphy more beautiful in three-dimensional sense, texture and elegant color decoration; Modern lettering is a kind of "expressive" art, which further develops the unique language of lettering art on the basis of tradition and expresses the author's aesthetic interest and artistic pursuit.