Fig. 8

Artificial plant model. a The node module fixes the leaf module with a defined inclination angle. The leaf is plugged in a small socket in the module center. The socket inclination is changed by a screw and determines the inclination angle of the fixed leaf (left). The spacer module is used to vary the distance between leaves. They are available in heights (h) of 20 mm, 40 mm and 50 mm (right). Lateral view on b planar and c bent artificial leaves. The insertion angle α describes the initial inclination angle at the stem. Parameter r denotes the leaf bending radius