Solar collectors are placed in orbit around a star, gathering energy for use in orbital colonies and factories around them (not visible on this picture). As they become more numerous, they are gathered into bands inclined to each other to limit shading.
The star is now almost completely enclosed by solar collectors gathering most of its output. The bands of collectors have slightly different radii, giving the system a shell-like appearance.
Ringworld Images by James W. Williams. Renditions of the classic Niven ringworld. This is a single structure orbiting a star, similar to a linked band in my model. It rotates so that the centifugal acceleration gives rise 1 G at the surface. Unfortunately it requires a hypothetical supermaterial to work...
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