Overhead signage. Not a street in the city where advertising isn't trying to sell someone something. One of the most noticeable differences about city life, heavily overbearing signs hanging above your head as you walk down the pavement, a suspended ceiling of metal, wires and lit up plastic.
The photos taken at night are from Nathan Road, Tsim Sha Tsui, Kowloon. As for the two day time shots, I'm not entirely sure but I have a vague recollection that they are from Kennedy Town, West of Central on Hong Kong Island.