You need an object called a prism, made of crystal clear glass. A prism is triangular and can break one ray of light into a rainbow of colors. This is the best explanation with picture I could find, it is a personal blog and you need to scroll down to where the prism is:
| Attributes | Values |
|---|---|
| rdfs:label |
|
| rdfs:comment |
|
| dcterms:subject | |
| abstract |
|