In order to do groundbreaking science, NASA’s James Webb Space Telescope must first perform an extremely choreographed series of deployments, extensions, and movements that bring the observatory to life shortly after launch. Too big to fit in any rocket available in its fully deployed form, Webb was engineered to intricately fold in on itself to achieve a much smaller size during transport.
Source:
https://phys.org/news/2019-08-critical-deployment-nasa-webb-secondary.html