[martin-]

But if cyan for me is blue, and for you it's green, or neither (though that option is not available in this test), then that DOES tell us if our definitions of the word "blue" match. For me, the concept "blue" covers the cyan part of the spectrum, while for others it clearly doesn't.

[Grimblewald]

A neither option would also work. Point is half the colours i was shown fall into neither