Inside, the sculpted lines of a cast-in-place concrete ceiling beautifully mirror the angular geometries of the plan and cast a heavy presence over the worshipping space below. Eerie natural lighting is provided by a lone oculus over the central altar and is supplemented by a dance of dim artificial lights over the smooth concrete ceiling. A dark, natural material pallete consisting of gray slate floors and mahogany pews completes the cave-like ambiance.