The material is the principal image of these series posters. Two characters “Xue” and “Xi” (a Chinese word means study) are formed by a Chinese traditional wooden toy named “headache 12.” It cleverly combines the game and study, which are two different activities. It implies the recognition for tradition and the praise for activities which are good and healthy to mankind. These two Chinese characters and the clean texture of the wood seem to deny any interference from the outside world and focus on study.