"Hymnal Echoes" is an art work themed around the universe and civilization, inspired by the Three-Body Problem novel`s mention of the Singer civilization and the concept of echoes. Through the fusion of projection and sound, the work creates an immersive experience that transcends time and space. The Singer symbolizes distant interstellar civilizations, transmitting information in unique ways, forming waves of sound across the cosmos. The Echo represents the moment when these signals are captured and responded to by other beings in the depths of space—like the reverberations and reflections of the universe itself. Presented on the Niaowu architecture in Beijing`s Wenyuhe Park, the piece uses light and sound to simulate the communication of civilizations through echoes, expressing humanity`s endless curiosity and exploration of the vast cosmos. The projections display symbols and imagery of the Singer civilization, seamlessly integrating with the surrounding natural environment. This interplay invites the audience to experience the immensity and mystery of the universe, evoking a profound reflection on humanity`s own insignificance and grandeur within it.