A keyboardist was playing a selection of Scarlotti’s harpsichord sonatas, brief pieces one to three minutes long, very complex and refined, while the Hadrosaurus herd streamed by the window. There were hundreds of the brutes, kicking up dust and honking that lovely flattened near-musical note they make. It was a spectacular sight.But the hors d’oeuvres had just arrived: plesiosaur wrapped in