The number system of the Yuki, Americans native to northern California, was based on fours and eights. The Yuki number system is often described as based on counting the four spaces between the fingers, and there are number systems known to do this, as for example, the number system of the Aymara of Peru. In actuality, the Yuki counted sticks that were held in the spaces between the fingers. The Yuki words for numbers, along with a few historical documents that describe the use of sticks in pairs, suggest a hypothetical reconstruction of the stick configurations used. Most likely one hand held the sticks, while the other hand placed and reconfigured them. In the Yuki system, the terms eight and sixteen appear to have been productive, which would make these numbers an octal-hexadecimal system. California was home to other counting systems based on four, as recorded by early missionaries. These include the number systems of the Ventureño Chumash, a people indigenous to central-southern coastal California and adjacent islands, and the Salinan, a tribe whose ancestral homeland was in the central California coastal region.