They did very simple patterns such as "TFG" (Taipei First Girls 'School) or "GO". Huang experimented with many materials until he decided to use plywood, with a sheet of colored plastic on each side.
學生手持不同色板，在變換正反面不同顏色時顯現出簡單的圖案，不必複雜的技巧，各校都能學得很好。