Chicago Millennium Park is the best urban public space design I've ever seen. Apart from the functions of city gardens, they are open, beautiful, dynamic and interactive, embodying people-oriented care everywhere, meeting the needs of different groups, whether old people, young people or children, can find suitable areas for their activities. On the side of the park near Michigan Avenue, there is a unique modern fountain, Crown fountain, designed by Spanish designer Piranza. Water is constantly pouring down from two 15-meter-high cubic towers to form water curtain waterfalls. In the middle of the two cubic towers are shallow pools of water and feet. The surface of the cube tower is made up of LED square screen, which shows colorful faces. This is a color photograph of 1,000 Chicago citizens of different ethnicities, sexes and ages. It is alternately played with music and replaced with one for 10 minutes. The theme is that the Chicago people welcome friends from all over the world. This is the children's playground, they enjoy playing, playing and chasing. Interestingly, these faces not only laugh, but also close their eyes and pout their mouths, and their expressions are very much. After a while, a water column suddenly sprayed out from his mouth, and the children playing around rushed to stand under the water column. This is the perfect combination of modern art and modern science and technology.