undisputed piece of figurative art. The Swimming Reindeer of about 11,000 BCE is among the finest Magdalenian carvings in bone or antler of animals in the art of the Upper Paleolithic. At the beginning of the Mesolithic in Europe, the figurative sculpture was greatly reduced, and remained a less common element in art than relief decoration of practical objects until the Roman period, despite some works such as the Gundestrup cauldron from the European Iron Age and the Bronze Age Trundholm sun chariot. The oldest European cave art dates back to 40,800 and can be found in the El Castillo Cave in Spain, but cave art exists across the continent. Rock painting was also performed on cliff faces, but fewer of those paintings have survived because of erosion. One well-known example is the rock paintings of Astuvansalmi in the Saimaa area of Finland. The Rock Art of the Iberian Mediterranean Basin forms a distinct group with the human figure the main focus, often seen in large groups, with battles, dancing, and hunting all represented, as well as other activities and details such as clothing. The figures are generally rather sketchily depicted in thin paint, with the relationships between the groups of humans and animals more carefully depicted than individual figures. Prehistoric Celtic art is another distinct grouping from much of Iron Age Europe and survives mainly in the form of high-status metalwork skillfully decorated with complex, elegant, and mostly abstract designs, often using curving and spiral forms. Full-length human figures of any size are so rare that their absence may represent a religious taboo. As the Romans conquered Celtic territories, the style vanished, except in the British Isles, where it influenced the Insular style of the Early Middle Ages. Classical art Ancient Greek art stands out among that of other ancient cultures for its development of naturalistic but idealized depictions of the human body, in which largely nude male figures were generally the focus of innovation. The rate of stylistic development between about 750 and 300 BC was remarkable by ancient standards, and in surviving works is best seen in Ancient Greek sculpture. There were important innovations in painting, which have to be essentially reconstructed due to the lack of original survivals of quality, other than the distinct field of painted pottery. Black-figure pottery and the subsequent red-figure pottery are famous and influential examples of the Ancient Greek decorative arts.