Imagine a diameter 1000km long O'Neill cylinder orbiting a dwarf star, it acquires most of its energy from the star directly.
This space station is designed for research purpose but it has a relatively huge population density for it's size, and the inhabitants are actually part of the experiment to see how human copes in low g and experiencing irregular day and night cycle.
Rather than using smart panels to filter lights from the star the station adopts a rather interesting approach to simulate day and night similar to condition on Earth, the entire station will flip over at regular time interval by itself unpowered thus saving precious energy.
This is made possible due to the tennis racket effect so I am curious would this kind of oscillation match our circadian rhythm without wasting resources or it could put the whole experiment and all it's subjects in jeopardy?
As you can see this space station has a striking resemblance to an ill designed two handles tennis racket, it is consisted of 3 main components: Solar panel arrays(net), Living space(rim) and the Machinery(grip). The Machinery can move along the Living space by wheels to control the period of oscillation when tennis racket effect happens.