This paper presents “Body Cosmos”, an artwork that creates a symbiotic relationship between the human body and a simulated cosmic environment through volumetric rendering and particle system. Drawing from DICOM data to simulate the human body and nebulae, we create an interactive and dynamic virtual environment. The real-time bio-data of users, collected via heart rate sensors and EEG devices, is integrated into the visualization, fostering a personal engagement and unity within this ‘cosmos.’ Body Cosmos provokes curiosity and expands users’ imagination, and deepens their understanding of life’s macrocosm and microcosm. This exploratory project redefines traditional perceptions of the human body in relation to the universe, creating a unique lens to view selfhood, embodiment, and identity. As we look to the future, the system’s evolution will include incorporation of more bio-data sensors, an investigation into its potential psychological and physiological benefits, and the development of social interactive features through multi-user capabilities.