and then tracing their transparency onto paper:
If you are an adult in the Bay Area, or, like us the recipients of free tickets (Thanks Jon), then I recommend a visit to the exhibit. It is running until the end of January. I think for those with young children it's hard to do justice to the exhibition with children in tow, and it's not cheap, so for an hour makes an expensive day out. The parts that we were able to see were excellent, and Nigel and I would have happily spent much longer at the exhibition.