The central line on which the characters sit is usually the edge of the writing surface, such as along the edge of a stone monument.
) the only texts to have survived to the present day are tombstones and other stone markers, the majority of which were made between the fifth and seventh centuries CE.
Supposed by some historians to have resulted from contact with Latin Roman numerals, the resulting ogham alphabet is unique to Ireland.
Its beauty and usefulness lie in its absolute simplicity - ogham can be easily cut into wood or carved into stone.
Many Danish and English bogs have yielded archeological evidence of cloth and dress, and Roman historians such as Tacitus also document some of the customs of everyday Celtic life.
Some features of Celtic life were not as closely chronicled in classical sources.
These give philologists clues as to where the Celtic branch of languages may be placed in relation to other languages of the world.
Celtic societies, once considered "barbaric" as seen through the lens of classical observers, are now looked upon as advanced cultures networked through the bond of a common linguistic heritage.
Piecing together the culture and lives of the ancient Celts, in the absence of clear archeological or textual record, is not an easy task.
The first of these is documentary sources, or texts.
Because concepts like language and cultural identity have no physical manifestation, written records are our only source for reconstructing them.
Celtic women, upon reaching maturity, adopted a complex braided style for their hair, and wore dyed and embroidered dresses.