This is a visual image created for my 30-year-old solo exhibition. The core graphic is the familiar "speed limit 30" traffic sign. 30km/h is the slower speed in driving. I let myself slow down in the special year of 30, sort out the past and plan for the future. The main materials of the exhibition are made with traditional enamel technology. It is a very warm material, which reminds me of the enamel water cups and enamel rice bowls I used when I was a child. These enamel materials were produced by an old enamel factory in Cangnan, Wenzhou.