The connections between Shenzhen and Hongkong are gradually increasing. Based on the form of the Chinese character “双”（“twin”）from the exhibition title (“HK-SZ Design Twin-Cites”), we try to describe the concept of “cities connection”by generating randomly lines shapes that intersect at points. The speed of rotation, the number of points and the thickness of lines, etc. can be adjusted through the programming software. A new dynamic visual system is therefore designed and developed, in order to show the core content of this exhibition – the joint creation between the two cities.