SOL – an interactive spatial installation staging the origin of solar energy. In an immersive environment the principles of nuclear fusion can be experienced in a narrative and playful way. Entering a bright and glistening corpus, the visitor experiences the darkness inside the sun and watches the chaotic motion of protons. Thankfully, radiation not included. Interacting with the particles causes them to fuse and produce energy which manifests as light bursts inside “the core” as well as a rising light level on the outside.