Reader’s Help: What in the world is this Celluloid piece?

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Not too long ago, I ran into this great vintage celluloid piece at a local flea market.  I know that it’s some sort of holder, but what exactly was it used for?

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In one reference book that I have, the book shows it and does not mention what this is.  Another book stated that it was a tooth brush holder, and yet another states that this is a holder for eyeglasses.

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Needless to say, I got pretty baffled on what this could be.  So here’s my question–what is this piece really for?  Is what one of the books said right, or is this something completely different?

Any information is greatly appreciated.  What do you think it is?