Domes may be constructed with many planes so they resemble the facets of a diamond. The structural problem in designing these shells is to provide enough angle between the planes so that an actual rib is formed which will be stiff enough to support the plane surface. Usually it is best to start with a spherical translation surface or other mathematical surface and have all the intersections lie on this surface. Otherwise, there may be discontinuities in the layout of intersections which make or destroy the visual effect and make the structure more difficult to design.
This dome can be of much greater span than the previous example because the span of the individual slab elements is less. A dome hexagonal in plan can be made continuous with all the adjacent units if it is necessary to cover a large area.