A general term used to describe the small and portable objects produced by artists during the Upper Palaeolithic period. These included carved or engraved stone, bone, ivory, or antler, and small crudely fired clay models. Artifacts include figurines, artists' trial pieces, decorated weapons, tools, and ornaments. The distribution extends from Siberia to Spain. Cave art covers the paintings, engravings, and reliefs found on the walls of caves and rock shelters of the same period. Unlike wall art, which is difficult to date, mobiliary art is usually found in archaeological layers and can therefore be dated. The earliest pieces probably date to about 35,000 years ago and they continued being made throughout the Upper Palaeolithic to c 10,000 BC.