823. Accession.

If any corporeal substance receives an accession by natural or artificial means, as by the growth of vegetables, the pregnancy of animals1 or the embroidery of cloth, the original owner is entitled by his right of possession to the property in its improved state2. Similarly, when the goods of one person are affixed to the land or chattel of another, they may become part of it and so accrue to the owner of the principal thing