We visited the Levity III luminarium today, which is currently visiting Lydney. It's basically a large maze of colour, curves and geometry... architects-of-air.com/.
If any of my local Flickr contacts can find the time to visit before it leaves, I recommend you do.
Levity III is inspired by the beauty of natural geometry and by Islamic architecture. It features winding passages of small domes inspired by repetitious forms found in the bazaars of Iran.