Bodies of dead animals and humans decompose after death facing a process of skeletonization, which can take up to some years: the soft tissues of the body dissolve, leaving the bones exposed. The bones themselves dissolve as well and, depending on the climate conditions, this can happen in a range of 20 to 100 years; in special situations, related to the quality of the soil, the bones can undergo a process of fossilisation and persist forever in the form of minerals. As humans, we developed the ability of leaving much more than just bones after our death: we have learned to shape the materials we could find around us, cut and carve them, mix, move and assemble them in different compositions. When we will no longer be here, traces will remain of our presence beyond our bones and fossils, traces of objects we have produced, of cities we have built. This already happened: roaming around ruins of ancient worlds, we observe the vestiges of our ancestors, we look into the past of disappeared civilisations, we wonder about myths and legendary cities, we step on layers of history, buried by layers of human and natural catastrophes. This already happened: prehistoric tribes and ancient populations, defined as peculiar and unique systems of cultural, social, economic characteristics related to a geographical context, no longer exist; they have instead transformed into something else. Human though is the most recent species that formed on planet Earth, in geological terms. Only few of the prehistoric animal species (something around 1% of the original ones) have actually transformed and therefore survived across millions of years (like sharks and coelacanth); the rest, thousands of species, is now extinct, what remains are fossils or bones. A stone is used to build a wall, a marble block is shaped into a column, bones turn into minerals, a temple dissolves into fragments, artefacts dissipate into soil. Sometimes we stop in front of a rock surface, a landslide or a self standing stone and ask ourselves: is it natural or man made? Did it roll there or somebody placed it? Did the rain and wind shape it or the hands of somebody did? Sometimes we cannot answer. Also, what is now a stone might have been once a piece of a column. Something natural which was artificialized might become natural again. Bones and rocks and menhirs and minerals and columns and fossils and stones and ruins and sand. All morphing one into another. It’s the cycle of matter, and we are just part of it. This project is an ongoing research; it is the result of a collection of images that took place in different times, and different places, in small timeframes during other works. The absence of any kind of geographical or time reference is meant to remark the idea of the cycle of matter, and of the universality of this process.