Going cashless may be all the rage in mainland China and places chasing “smart nation” targets, but Tommy Tam Kar Hay is relieved that, for now at least, hard cash still rules in Hong Kong. There is plenty about the look, feel and history of banknotes to treasure, says the art director for HSBC’s Global Publishing Services, which works on the design of banknotes. Hong Kong’s banknote designs tell a lot about the city, its history and what was important at different...