(Which I don't think is right as it fails the grammatical test, but interested in audience reaction)

Seeing red, sky blue pink, etc:
I'm going to give the baton to INJ. But perhaps Projoy should have it. The word on the card is simply "red." I got hung up on the philosophical distinction between the color itself as a physical phenomenon and the name that we give to the color. I ended up giving a misleading answer on PJ's "name of a color" question. Apologies all around -- I'm new to this. I should have watched longer before accepting any batons.

Fair enough, and I think outside of the name of a color q you answered the questions pretty fairly (altho I think I might have been entitled to at least a few claps from the audience for "red shift", tho!).

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[PJ] Agree, I was not so good at channeling the audience, either. :-)
*offers compensatory applause and the baton* Do you want the baton, then? Or is it INJ's?

[cfm] Up to INJ, I guess.

Well, provided that you promise to guess it before Friday lunchtime, after which I turn into a pumpkin, I'll have a go.
This one is mostly MINERAL with ANIMAL connections

[PJ] Discrete - YES
[CdM] Building /Edifice? - YES

i.e. Is it significant enough that you would imagine architecture students studying it?

[CdM] Pre 1800? - Not telling
[PJ] Pre 1945 - NO
[cfm] Fishy? - NO
[GLogin] Post 1792? - I refer the honourable gentleman to my previous answers
[FGZstar] Significant? - Probably - not sure how I would know.