香港1990/2010 ......穿過不能捉摸的時間，只能感覺，不能操控，但四維世界卻是活生生的 真實；時間與空間有不可分割的微妙關係，但昔日的時間卻彷彿不著痕跡地 悄悄溜走，留下憔悴的空間讓人憑弔。攝影師WU嘗試以千禧年作分界，在其 前後經歷近廿年的時光，重訪居住地香港的各區不同地方，用地誌攝影的方式 作時間戳記，記錄香港回歸前後兩個十年間(1990/2010)的變化，以比對方式 把城市景觀久歷時間的痕跡展現，盼能讓觀眾游走於時空，體驗穿梭時間的 視覺旅程。
HONG KONG 1990/2010 ……could the time we walked through only be perceived, not conquered, nor touched, the 4-dimentional world is however a lively reality. There exists a delicate but subtle relationship between time and space, amid the untraceable past times passed silently, what left behind was a lonely space for us to recall and remember. Photographer WU set apart the time before and after millennium, in course of almost two decades across the sovereignty handover  (1990 / 2010)  revisited numerous of places he once visited, documented the changes of cityscape of Hong Kong through the time using a topographic approach. By contrasting the timestamp of the same place distanced by time, he hopes to give the viewers a visual journey of time.