Lightness

Italo Calvino

The De Rerum Natura of Lucretius is the first great work of poetry in which knowledge of the world tends to dissolve the solidity of the world, leading to a perception of all that is infinitely minute, light, and mobile. Lucretius set out to write the poem of physical matter, but he warns us at the outset that matter is made up of invisible particles. He is the poet of physical concreteness, viewed in its permanent and immutable substance, but the first thing he tells us is that emptiness is just as concrete as solid bodies. Lucretius' chief concern is to prevent the weight of matter from crushing us. Even while laying down the rigorous mechanical laws that determine every event, he feels the need to allow atoms to make unpredictable deviations from the straight line, thereby ensuring freedom both to atoms and to human beings. The poetry of the invisible, of infinite unexpected possiblities - even the poetry of nothingness - issues from a poet who had no doubts whatever about the physical reality of the world.