Invisible <voi### [at] devnull> wrote:
> Uh, no, the *cyan* lense is supposed to block red. The *red* lense is 
> supposed to let it through. It shouldn't be blocking it at all.

  The cyan lens blocks red light... making it look black. The red lens
blocks everything else other than red.

  Thus it depends on whether the *background* is black or white which lens
allows you to see the red lines. When looked through the red lens, a red
line against a white background will not be visible because everything
looks red. However, a red line against a black background will be visible
because the red line is the only thing which reflects light (and passes
through the lens).

-- 
                                                          - Warp

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