Light pollution hides views of the cosmos and causes a host of environmental problems. But architectural and landscape lighting can be designed so that it is sensitive to the night sky and ecosystems yet still responds to clients’ requirements.

London-based John McAslan + Partners designs a mosque in Qatar and a Roman Catholic church in Kenya.

In the middle of the desert in Qatar, four enormous steel plates rise from the bleak landscape, oriented along an east-west axis over a half-mile stretch.