I showed them to Leonardo Vinci the painter. He praised all of them but especially the crystal one, because it is all of one piece and very clear.... and Leonardo said that he had never seen a better piece.
I would love to work with people who want to be a part of a digital humanities project mapping the daily life of the Italian Renaissance in detail. Do you have graphic design skills? Or are you a Neo4j/ASP.NET developer? Or just someone who loves the Renaissance like myself and would like to help build the knowledge base? Do get in touch!