Here is the front side of this double-sided poster, which is a timeline. The numbers on the left side is my age. There are four main colors, blue, green, orange and red, which represent four periods of school time. And each bar represents a friend. You can see how long our friendship last from the bars. The friend who is still close to me, which means the bar of him/her would keep growing to the top and then a head of him/her just pop up.
The friends who is closer to me, the skin head in the yellow circle, represent the same meaning literally and visually.
There are some informations like the sex ratio of my friends and where I met these friends on the bottom. Viewers can look for detail informations of each friends on the back side.