"Líthi” is an immersive audiovisual installation which is composed of laser modules, strobe lights and sound in the long narrow space which is specifically designed with mirror panel overhead. 8 lasers are oriented perpendicular to the slit of the space, and each lasers are controlled independently with intense yellow light which is synthesised with sound. Those trajectories of laser light are inextricably intertwined with strobe light and sound, it creates dynamic spatial form. The term "líthi” is transliteration of "Λήθη”: one of the five rivers of the underworld of Hades in Greek mythology, flowed around the cave of Hypnos and through the Underworld where all those who drank from it experienced complete forgetfulness. The word means “oblivion” or “forgetfulness”. The motion of lights; random drive or sequential action such as swinging back and forth/up and down behaves as accessing memories and it sculpts the abstract moment in space, and overhead river of forgetfulness reflects those behaviours. By using only abstract information, audiovisual rendering provides shaper synesthetic experience as pure audiovisual perception. The work pursue setting out new phase of use of space by light and sound, and how different medium can be merged in space and time as single unit. It fulfills space with abstract information to give audience more spatial and pure visual and auditory sensory experience in immersive environment.