Reconstruction of the roof of the Demeter Temple, using the original fragments dating from around 530 BC. Plates of translucent marble laid off part of the sunlight that illuminates the inside of initiation as lactic cave temple, as the temple walls were pure white and deliberately only roughly shaped blocks. (The ceremony took place at dawn, perhaps.) Archaeological Museum of Demetrion in Gyroulas at Sangri, Naxos.