I don't quite have enough free time to put up a page purporting to test which colors you can see — especially since there's no straightforward way to test frequency response as such in humans, especially not on a normal monitor which is RGB-based. I was just very amused by the sound frequency response meme, so I thought I might mix things up a bit.
I don't remember where I got it, but I find it useful occasionally, more for instances of real compufrustration than for this smack-forehead-with-palm moment.
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And how are your sisters, Meg & Tis?