Transience is the Japanese calligraphy work with dynamic color changes. The scene where the letter colors are changing from moment to moment can give affluent dynamism and feeling of vitality of calligraphy to viewers, and at the same time, it can express stream of time. Calligraphy is integrated with technology and materials seamlessly and Transience is produced to show ever-changing aesthetics fermented in Japan. In order to change letter colors on paper, we developed our original chromogenic mechanism from functional inks and conductive materials. For producing the chromogenic technology suitable for paper, we examined ink materials repeatedly, and as a result we realized the expression where calligraphy harmonizes with computer.