What is this gigantic dish at Ben Gurion airport? As the title asks, what is this thing for?  Have never seen anything like it at other airports I've been to.
It is just a design feature, and serves no technical purpose, beyond filtering some light and providing a waterfall feature.


  Safdie designed the roof of the rotunda as an inverted dome, an asymmetric dish floating above the piazza that lets sunlight in and filters the daylight with a special white fabric ceiling.
  source: https://www.bdcnetwork.com/ready-takeoff


and


  Rain falling upon the suspended dome drains towards the center and enters the rotunda through an oculus skylight as a waterfall. In the dry season, a continuous flow of water washes the roof, contributing to the rotunda’s cooling and forming a fountain through the oculus.
  source: https://www.safdiearchitects.com/projects/ben-gurion-intl-airport-airside-terminal


Image, because it looks nice (Same source as second quote above)