Urban gray space cases

Quick answer：

Urban gray spaces refer to the areas in between buildings, such as alleys, courtyards, and public squares, which are not usually classified as public or private spaces. These spaces are important for urban design and can serve various functions like community gathering, traffic, and greenery. Examples include the historic areas of Kyoto's Gion, where gray spaces are used for cultural activities, and New York's High Line, a converted freight rail line turned into a public park.