In this activity, learners will make their own prism and use a glass of water to separate sunlight into different colors. Using a piece of cardboard with a small hole and a white piece of paper, learners will direct sunlight through the prism to make a rainbow. Step-by-step instructions with photos and safety measures are include. This activity needs a sunny day. Activity guide includes a "What's going on?" explanation and connections to relevant science concepts like slowing the speed of light & refraction, component color of white light, and how rainbows are formed in the atmosphere.