With the passage of time, we forget some people and some faces each day. Meanwhile, we walk pass a lot of strangers everyday, just leaving our back views to each other. I spent one year (365 days) photographing one stranger's back each day. I made use of this kind of art form to record strangers passing by me. The digital data printed on the side of each photo is the proof of this work. In the end, I compiled all photos I took in the whole year into a book to reflect this period of experience.. The book's cover is made of memory foam and white blanket. The foam will appear a cave when one pushes hard on it, but will gradually gets back to it’s original smooth look later. The soft surface and special touch feeling is just like our memory for strangers, disappearing in a blink.