A hill figure is a large visual representation created by cutting into a steep hillside and revealing the underlying geology. It is a type of geoglyph usually designed to be seen from afar rather than above. In some cases trenches are dug and rubble made from material brighter than the natural bedrock is placed into them. The new material is often chalk, a soft and white form of limestone, leading to the alternative name of chalk figure for this form of art.
The creation of hill figures has been practised since prehistory and can include human ("gigantotomy") and animal forms (cutting horses is known as "leucippotomy") as well as more abstract symbols and, in the modern era, advertising brands.
The reasons for the creation for the figures are varied and obscure. The Uffington Horse probably held religious significance, whereas the Cerne Abbas giant might have been a work of political satire.citation needed The figures are usually created by the cutting away of the top layer of relatively poor soil on suitable hillsides. This exposes the white chalk beneath, which contrasts well with the short green hill grass, and the image is clearly visible for a considerable distance. Despite some of the figures being of great age, they are at the same time relatively new. The figures need to be maintained to stay visible, and local people often work to restore their local landmark on a regular basis, thereby continuing an unbroken tradition.
Lost figures
Since hill figures need to be maintained by the removal of regrown turf, only those which have motivated the local populace to look after them have survived. Ancient figures all have an associated fair or ceremony which involves maintaining them.