Lighting the Reef
We present Lighting the Reef, an interactive installation that uses modular 3D paper circuits to explore ecological fragility. Participants build coral structures from foldable paper blocks with copper tape and low-voltage components. When connections align, coral modules glow, metaphorically expressing the energy exchange between coral and zooxanthellae, the symbiotic algae crucial to coral metabolism. Pollution modules add resistance that dims light or interrupts the current entirely, mirroring environmental disruption. We position Lighting the Reef as a Research through Design case that articulates fragility as an interaction aesthetic and ecological metaphor. We reflect on how modular circuitry, material constraints, and embodied play make precarity tangible. We also report workshops with 15 participants that discussed themes of care, collapse, and interdependence. We contribute insights into designing for fragility with modular circuits, ecological storytelling through tangible interaction, and accessible and reproducible designs for participatory sustainability education.