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The Smart Rainbow Umbrella is a low-cost and engaging STEM innovation developed to address the challenge of teaching light refraction and rainbow colour formation to Year 2 pupils. The innovation utilizes simple, safe, and recyclable materials such as OHP plastic, ice cream sticks, and a spray bottle to simulate a natural rainbow using white light and water droplets. As light passes through the curved plastic dome sprayed with mist, the phenomenon of refraction and colour dispersion becomes visible, making learning both meaningful and memorable. This interactive model offers a solution to the abstract nature of optical science for young learners, providing them with a hands-on experience that enhances understanding. The innovation also supports the integration of 21st-century skills by fostering creativity, design thinking, problem-solving, and environmental responsibility through the use of recycled materials. Classroom implementation showed a significant increase in conceptual understanding, focus time, and enjoyment. Supported by regional research and grounded in current pedagogical theories, the Smart Rainbow Umbrella presents a scalable and adaptable tool for primary STEM education, with potential for digital enhancement and wider dissemination.

Keywords: Refraction, Rainbow, STEM, Hands-On Learning, Sustainability