The Pierneef or open-umbrella shape is exclusive to Africa.

The African continent has the largest variety of flora in the world, but the Acacia dominates the African scene.

These superb trees with their semi-circle crowns, like open umbrellas, inspired Charles to develop a new African style.

The umbrella-shaped form was spontaneously named after the well-known South African artist, Jacob Hendrik Pierneef, who depicted many of these tree forms in his paintings.