h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Blue is electromagnetic radiation of wavelength around 4*10^-7 to 5*10^-7 m. Also, the property of objects which reflect electromagnetic radiation (a.k.a. light) of this wavelength and absorb most or all others in the visible spectrum.
I think that that is pretty definitive, except when used to describe the emotion.

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Only in combination with a conscious perception of this wavelength as being "blue". Other organisms may perceive this as green, red or whatever..

Which is a problem because the definition then becomes circular.. i.e.
"That electromagnetic radiation of wavelength which is or is perceived as or defined as blue"..

err..

The bigger question is what came first, the colour orange or the fruit?

If the colour we percieve as blue is known as 'green' or 'red' by another species, that's a problem of language translation rather than definition.

My name is blue.

Which is odd because your nickname also includes red.

It's gold, man, GOLD! 'La Reine des Poissons Rouges' means 'Queen of the Goldfish'. Okay, technically, you were right, but too many people call me 'Queen of the Red Fish', which is altogether less dignified, don't you think?

True, and I apologise. As you can see, I really ought to know better.

I was only joking... sorry if I offended you...

So neither of us is offended but both of us is sorry. Could someone copme along and be offended to take care of this surplus sorrow? Or 'blues' to put it another way.

Blue is like red, but a different colour, or color if you prefer, which isn't to avoid the question that it ends up being a relitive question of perception as a result of the names themselves, and not the individual wavelength of the light concerned to give the colour its perceived state of perceptual naming.

Nothing has a name which is fundamental to its nature. A rose by any other name, and all that.

It's a 4-letter word.

Oh not another philosophical question that has no real answer.I'm happy with what I percieve blue to be and that's that.

Incog.

Blue? How would I know? <blue?

H.

<=475nm

Blue is blue like water is red,
pollute the plannet and all eat bread Blue is a state of perpetual cheese.
Blue is teh colour of cheese.
Cheese is teh colour of blue.
Blue isn't as tasty as cheese unless it is blue cheese.
Chese is cheese spelt incorrectly.
Blue is the word bluee without the e at the end.
Blue is my fingers.
blue is not the colour of my hat which i lost, went to collect, found out they didn't have, went to collect again, and found they did have. blue is not the colour of my swamp creatures or the screaming hords of worriors running across my brian.
Brian is like blue spelt incorrectly.
just think of the possibilities of navey blue! cheese is not contained in a hat that is not blue, so blue is not the colour of a non-cheese containing hat. blue is, or should not be the colour of the i drunk last nite. Blue may, or maynot be the favourate or most hated colour of nighthoover, the true prophet, and ruler of the small spaces behind pieces of furnature.