I recently bought this small set of photos, showing men and women at work on Hong Kong's streets.

This week's story begins like many on Gwulo: seeing something new on a walk and thinking, "That's a bit odd ..."

We'd just walked uphill from the lower Shing Mun Reservoir, and noticed there was a large metal pipe running alongside the path. When the path levelled out the pipe ended abruptly, pouring water out into a concrete channel.