4. Other Shapes

Beside domes and spheres other shapes have been realized like cylinders (figures 15, 16).
Figure 15: Cylinder (a).
Figure 16: Cylinder (b).
A real new step was made at the development of objects in which the inner space of the sphere is used too, as in figure 17. This object has the form of two linked concentric spheres. The whole is a stable construction consisting of 24 elements. Each element is halfway (that is to say with two out of four connecting points) in the outer sphere and halfway in the inner sphere. The object of figure 18 is a different example; it is composed of 12 elements. Three of the elements leave the outer surface of the sphere with its middle part leading to an intriguing structure.
Figure 17: Concentric sphere.
Figure 18: Inside the sphere.
In June 2003, there will be a seminar held at the da Vinci Museum at Vinci, Italy to explore the relationship between Leonardo’s sketches and the constructions shown. We will attempt some large-scale constructions using notched poles at that time (see figure 19).
Figure 19: Dome with poles.