Megalithic art[edit]Megalithic artKnowth contains more than a third of the total number of examples of megalithic art in all of Western Europe;[citation needed] over 200 decorated stones were found during excavations. Much of the artwork is found on the kerbstones, particularly approaching the entrances to the passages.Many of the motifs are typical: spirals, lozenges and serpentiform. However, the megalithic art at Knowth contains a wide variety of images, such as crescent shapes, and the oldest known illustration of the moon in history. Much of this artwork was carved on the backs of the stones; a type of megalithic art known as hidden art. This suggests all manner of theories as regards the function of megalithic art within the Neolithic community who built the monuments in the Boyne valley. It is possible that they intended the art to be hidden. It is also possible that they simply recycled the stones and reused the other side.History