No trickery, only common objects: One CD, one light source, one drop of water.
When CDs first came out, I was amazed by their reflective glow and the rainbows that shimmered across their surfaces when I tilted them into, and then away from, the light. I’m still fascinated by these properties. The sun, a flashlight, or even a beam from an overhead lamp will charge the surface with magic.
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