Conceived as a demonstration project for the future potential of emerging materials to creatively respond to the environmental challenges of the future, the fabric roof structure of Firefly emits a passive glow at night through its use of a pattern of screen printed photoluminescent pigments. By day, the same pattern will provide solar shading from the midday sun. Photoluminescent materials produce light through the slow re-radiation of luminous energy that is absorbed during the day. Similar to the bioluminescence of fireflies, photoluminescent materials provide an energy- efficient cool source of light without the use of an external source of energy. Ongoing research suggests great potential for its use in sustainable architectural applications in the future.