We joke a lot about the cranes which have filled downtown Nashville in recent years, but the glass skyscrapers that follow them have transformed the way our city looks. Our skyline, which for years was represented by the L&C tower — at one point the tallest structure between New York and Miami — is now covered in glass. What’s behind the evolution? And will it look the same in a century? We talked to a historian, an engineer and Tony Giarratana, the man who’s helped shape the way the city looks with his buildings, to examine the glassification of downtown Nashville.