These images don't really give the real feeling of being before a work by Turrell (who is one of many great contemporary artists that I haven't had a chance to discuss yet). I saw one of his works at the Whitney in NYC. It looked like a colored wall, but you could put your hand through it, and then it was all light and presence. It was quite a (non-sectarian) spiritual experience. He is now working on a crater in the southwest: Roden Crater.