Introduction to the Heavenly Book Stone: Among the writing stones, the "Heavenly Book" stone is the most difficult to identify. It is neither seal script nor official script, neither running nor cursive, either horizontal or vertical, and is full of twists and turns. This "heavenly book" stone is connected with each other, every word is connected, but there are pauses and gaps, which is quite rhythmic. We cannot understand its meaning, but we can vaguely understand the mystery contained in it from the lines. Through the thick font, we seem to be able to glimpse bits and pieces of ancient information and touch the traces of nature. The vicissitudes of life are condensed in this small strange stone.