Hong Kong trams, or ding dings as they're affectionately known, are cultural icons and have inspired a devoted following of tram enthusiasts.
Ricky Lau and Joseph Tse are two of the city's most impassioned. The pair not only founded the Amazing Ding Ding website and Facebook page, they published a series of Chinese-language books on local trams and their history last year.
Lau, a retired exporter, had a reputation as a collector of tram paraphernalia before launching Amazing Ding Ding - among the many items in his cache are more than 100 vintage tickets.
Collecting tram tickets is not unusual in Hong Kong but Lau's collection is special.
While most enthusiasts focus on lucky numbers or tickets with sentimental significance, he amassed tickets with a nearly obsessive zeal, slowly building up entire series for every tram route and number he could get his hands on.
"Some came from my friends, some from antique shops, and some are from eBay," Lau says. "Gradually, one by one I collected. I've got many many [tickets], about 30 rare ones and about 100 common ones."
As a child, he swam every day and would catch a ding ding by himself for an early morning ride to the nearby public pool. Lau says he never lost his love for the mode of transport. "Later, I still loved to travel in the ding ding instead of the bus."