Have you been to the Walker Art Gallery yet to see the Conrad Shawcross exhibition 'The Steady States'? You really should, not to be missed etc. There's only three pieces of sculpture but they're huge and involve a lot of science, cosmology, music theory and stuff so go prepared. Read the info on the Walker's website including the glossary of scientific terms and the interview and read some reviews. Then go and see it before it ends on February 26th 2006.
I was lucky enough to meet the artist last week. The poor guy was worn out after days of building the things but he kindly took time to talk about the works. I'm afraid my old brain had problems retaining the information. Actually its not that heavy really, its interesting and fun even if you don't bother to study the science.

Observer review
Daily Post review