Camera obscuras date back to about 2,500 years ago where scholars in China, Egypt, and Greece used camera obscuras to study light. Try making your  own!

Using just a flashlight and materials like a CD, a glass with water and a mirror, a crystal, and glass knick-knacks, we made all sorts of rainbows. If you pick the mirror and glass of water method, you’ll need to have a mirror that can fit *inside* the glass of water.