Taken today at Toa Payoh HDB Hub. Heh.
From Wikipedia on Street Photography:
Street photography is an art photography that features the human condition within public places and does not necessitate the presence of a street or even the urban environment. The subject of the photograph might be absent of people and can be object or environment where the image projects a decidedly human character in facsimile or aesthetic.
Also do check out this website, "Street Photographers - The art of street photography".