Sometimes in order to get closer to the theme of a creative piece, Wu may even inlay the object in question in the work, such as the pebbles in Memory River, the door plank in Door Knocker or the bike wheel spokes in Viewed From Behind.
有時為了更貼近主題，也會把實物鑲嵌在作品裡，如《回憶之河》的小石子、《門環》裡的門板、《背影》腳踏車輪內的鐵絲等。