This kind of font is similar to painting, some add some points to strokes, some pretend to be tortuous, and some add bird shapes to calligraphy and painting for decoration. This is the origin of bird prints and insect prints.
Characters formed by basic strokes with bird-shaped characteristics are very decorative. For example, in the tile of Long Live the Millennium, the word "thousand" is like a bird in the tile's heart, bizarre, strange and elegant. This hieroglyphic font reflects that Chinese characters originated from hieroglyphics.
In nature, the sun, moon and stars, mountains and rivers, birds and animals, their moving and static objects are all objects of writing, so there is some inevitable connection between the form of words and the real form of natural objects.
The tile-shaped characters of Flower-Bird-Insect Seal are descriptions of natural objects, highlighting the unpredictable situation of calligraphy art, which is undoubtedly based on the concept that characters are connected with natural scenery.
However, this description does not exclude the role of subjective will in the formation of words, but uses abstract stippling to express objects and combine them, which not only "imitates nature", but also integrates the thoughts and feelings of the creators, that is, "nature comes from the outside and the heart comes from the inside".