Re: A never-ending study on how to mess up humans...
Another reason to use a ring is that it allows people to walk from one place to another. If you put two modules on the ends of a beam, then to get from one to the other you have a long "climb" to get from one module to the centre and then a long "decent" to get to the other module. Climbs and descents significantly increase the risk of injury from falls compared to something where you can walk "on the flat".