The German critic Lessing, in his book "Laocoön", attempts to return poetry to a temporal philosophy and painting to a spatial philosophy in an effort to detect the differences between them. This led him to choose the name "Laocoön" as the title of his book. Laocoön was a priest of Apollo in ancient Greece, and the goddess was angry with him. "She sent a huge serpent that killed him and his sons. This myth inspired the poets and artists of Greece and Rome, and they created images imagining the punishment of Laocoön and the serpent that attacked him. Then Vergil, the Roman poet, described his agony in his poem." Then Lessing picked up the thread from the image, the painting, and the poem to explain the difference between painting and poetry, trying to distinguish between the realm of poetry and that of other arts.
We find that Lessing is the one who added the concepts of time and space in his classification of the arts. He distinguished between the static spatial plastic art and the dynamic temporal poetic art.
Lessing's theory can be summarized in his statement that if it is true that painting, in its imitations, uses means or signs completely different from those used by poetry, which are forms and colors in space, while poetry consists of sounds that are pronounced in time, and if it is certain that the signs necessarily connect with what they signify in a relationship of fitness, then the signs that are coordinated side by side can only express things that are successive or have successive parts. And Lessing defines space as the simultaneity of things within a comprehensive view, which is the unified form of vision. So spatial things are those that the eye sees at once, for space is the unity of things within a slice of time and they coexist in a fleeting vision. Here Lessing emphasizes the principle of the connection between spatiality and the sense of sight, and because of this concept of space, he was able to combine rhetoric and painting as if there were no essential difference between them.
Lessing believes that "the elements that are adjacent to each other, or the constituent parts of which they are composed, which come in succession - these things - we can call them bodies, and thus these visible bodies are the essence of painting. As for the subjects that follow one another, or parts of which follow one another, we call them events, and thus these successive events are what we call the essence of poetry."
Therefore, the ingenuity of painting lies in freezing a certain moment and fixing it in a fixed place, while the ingenuity of poetry lies in revealing the dynamic activity and its efficacy that belongs to a series of successive moments. And this is what Lessing meant by saying "Poetry has moments in time and painting has a moment in space." So the painter can only use one moment of the event and depict it as briefly as he can and carry it out with all the tricks and technical means. But on the other hand, there are many infinite elements that the poet can express about this subject in words, using the tools specific to the art of poetry, which is the freedom to deal with the past or future moment, so that he can present to us not only what we can see in the painter's work, but also what we can anticipate.