Ebony && Ivory .

Ebony (Diospyros ebenum), also known as India Ebony or Ceylon Ebony depending on its origin, is a tree in the genus Diospyros, native to southern India and Sri Lanka. It is noted for its heavy black, fine-grained heartwood. It is a medium-sized evergreen, reaching 20–25 m tall. The leaves are entire, about 6–15 cm long and 3–5 cm broad. The fruit is a small berry 2 cm diameter, similar to a small persimmon. Ebony heartwood is one of the most intensely black woods known, which, combined with its very high density (it is one of the very few woods that sink in water), fine texture, and ability to polish very smoothly, has made it very valuable as an ornamental wood.

Ivory is a hard, white, opaque substance that is the bulk of the teeth and tusks of animals such as the elephant, hippopotamus, walrus, mammoth and narwhal. The word "ivory" was traditionally applied to the tusks of elephants; the word is ultimately from Ancient Egyptian âb, âbu "elephant". Ivory has availed itself to many ornamental and practical uses. Prior to the introduction of plastics, it was used for billiard balls, piano keys, bagpipes, buttons and a wide range of ornamental items. Synthetic substitutes for ivory have been developed. Plastics have been viewed by piano purists as an inferior ivory substitute on piano keys, although other recently developed materials more closely resemble the feel of real ivory.

* I just found it interesting to compare two different materials . Black && White combo . hehe .