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Is "of blue" in order to mean "blue" grammatical? I am wondering if saying "blue sky" means the same thing as "sky of blue"? Is it grammatical? How idiomatic it is? I've seen some passage use similar structure in poems, but I am not sure how correct it is.

A shower of brilliant fireworks was reflected in the ponds; dazzling rockets rivaled the fire of the Pleiades in the sky of dark azure.

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Yes, it's grammatical—but in a slightly unconventional way. A sky of blue leads the listener to hear the adjective "blue" as a noun. It gives emphasis to the color in a way that "a blue sky" would not. Similarly for a curtain of green, a sea of grey, etc. You are right to notice that more ordinary grammar would make these "a blue sky", "a green curtain", "a grey sea", etc.

Writing noun preposition adjective instead of the customary adjective noun is a figure of speech—a deliberately unconventional use of language for rhetorical effect. It's a poetic device, not common in everyday speech or even in writing. Below are some similar figures of speech.*

The future was wide open. … The sky was the limit. Into the great wide open. [From a song by Tom Petty and the Heartbreakers. "Wide open" is first used as an adjective and then coerced into serving as a noun. This is abnormal grammar for poetic effect, giving concrete form to a feeling of limitless possibility.]

Go directly to fabulous. [An advertising slogan for the California Lottery. This kind of figure of speech is common in advertising, where the violation of grammar helps make a phrase memorable because it stands out from ordinary speech. This article in The Week documents many more.]

The hotelier's bank account was in the red, so he went into politics. ["In the red" is a familiar idiom for a negative bank balance. Like many idioms, it is a figure of speech. The word "red" here is an adjective treated as a noun, referring to the red ink used by accountants to record debts or losses.]

The King's name is a tower of strength. [Shakespeare, Richard III, 5.3.12. More evocative than "a strong tower". The reversed wording suggests that the King's name is a kind of source from which people can draw strength for themselves. Notice here that the adjective "strong" changed to the noun "strength". "A tower of strong" would unambiguously violate grammar, making it more jarring and hence more figurative.]

Dictionary entries for color words usually list them as both adjective and noun. One might therefore conclude that a sky of blue strictly follows the ordinary rules of grammar and therefore isn't figurative. I think a better way to understand it is that people hear "blue" primarily as an adjective but that pressing it into service as a noun is common and familiar enough for dictionaries to mention it. (The ordinary noun for "blue" is "blueness".)

Rules are a helpful crutch for beginners, but eventually one must outgrow the expectation that English works only by rules. The real principle is that we understand less-familiar forms and phrases as variants of more-familiar ones (as in any language). Three very strong, familiar landmarks in English are: "a blue sky", using "blue" as an adjective, and noun preposition noun. To understand "a sky of blue", we let "blue" slip into the role of a noun. This is easy because treating "blue" as a noun where needed is pretty familiar, but as you noticed, the clash with blue's ordinary role as an adjective is slightly odd here—just enough to make a figure of speech. The figurative meaning comes from the fact that we still treat "blue" as a modifier on "sky" but we're also influenced by many other "of" phrases, which name a material, origin, or other aspects of things felt to be deep or essential: "a sword of iron", "flowers of summer", etc.

Into the great wide open makes a stronger figure of speech because it abuses "wide open", which is normally an adjective. But treating the adjective "open" as a noun with roughly this meaning has been done enough that dictionaries mention it, so this phrase relates easily to another familiar landmark. Go directly to fabulous is jarring because "fabulous" has almost no history of being coerced to a noun, but the phrase as a whole is close enough to familiar landmarks that we easily understand it as a playful, deliberate variation.

A beginner lacks the familiarity with English needed to stray from the landmarks in a way that a fluent speaker will understand as deliberate. When beginners try this, it usually just sounds like a mistake. There can be no precise rules to learn, since by definition a figure of speech bends the ordinary customs of language.

So, here is the lesson from all this: you should master the most familiar landmarks and notice how common figures of speech, like a sky of blue and in the red, relate to the familiar landmarks that they vary. That's what enables you to leave rules behind and communicate by creatively combining common cultural reference points—the way everyone communicates in their native language.

* There are names for these figures of speech, though they are not widely known. Using a word as a part of speech that it normally doesn't play, like using an adjective as a noun, is called anthimeria. Putting a word into a different grammatical case than usual, such as making it into the object of a preposition when normally it wouldn't be, is antiptosis.

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    Is it just my imagination, or are we more likely to use this construct with colors instead of other adjectives? Maybe that's because a color like red or green can be used as a noun as well as an adjective? I mean, we might say, "A bumpy driveway," but "A driveway of bumpiness" is about as awkward as can be. – J.R. Oct 6 at 23:46
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    @J.R. I searched my mind for several minutes for an example that doesn't involve a color, and I couldn't come up with one. I went to get my copy of Figures of Speech by Arthur Quinn to see if he had one, and indeed he had quite a few. – Ben Kovitz Oct 6 at 23:48
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    @fredsbend The general idea of antiptosis is that you put a word into a different grammatical form or case than normal. In English, that works out to "make it the object of a preposition somehow". I was hoping to skip those details, but thanks, maybe they're needed. And thanks for of evil and of good! I'll see if I can find or make a good example of one of those. – Ben Kovitz Oct 7 at 3:36
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    @fredsbend I just found a good example with of evil. And I brought up the idea that most of these adjectives also seem well established as nouns. This is much better. Thanks! – Ben Kovitz Oct 7 at 4:37
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    @Len Thanks, I'll note the translation. It is unusual and might indeed better demonstrate antiptosis in Hebrew. I hope it illustrates some of the range of this figure of speech without luring the OP into thinking that this is how people normally speak and write in English. :) – Ben Kovitz Oct 7 at 5:19
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As the Beatles once sang:

Sky of blue, sea of green
In a yellow submarine

So, sure, you can say it that way if you want to – but I wouldn't recommend it.

in the sky of dark azure

is grammatical and means the same as

in the dark azure sky

but whether or not you'd really want to use that phrasing depends on a number of factors. For one, unless you are going for flowery or poetic prose, the more direct wording is usually preferred – with the adjectives in front – as this ngram clearly indicates.

Also, I think I'd be more inclined to use an indefinite article in your version of the sentence:

dazzling rockets rivaled the fire of the Pleiades in a sky of dark azure.

I'm not sure why, though. Maybe it's because, in those few instances where people do use an of to append the adjectives after the noun, it's more often done with an indefinite article. (See this ngram). Maybe it's just more idiomatic? I'm not sure.

  • On the other hand, couldn't the definite article be used for poetic effect, referring to "the" sky as already established implicitly by mentioning the shower of fireworks? Or even prosaically, in the way we usually refer to "the" sky. – Ben Kovitz Oct 6 at 23:47
  • @BenK - Sure it could. I have another theory that might explain why I prefer the indefinite article in that particular sentence: the fire of the Pleiades in the sky of dark azure might just be one too many occurrences of the. But it certainly wouldn't violate any grammar rule – it's just a stylistic concern. – J.R. Oct 6 at 23:51
  • Your examples are "in ... the sky" but there is also Rhapsody In Blue (Gershwin) and "do you have this shirt in blue?" – Weather Vane Oct 7 at 17:41
  • @WeatherVane - My examples are just variants of the OP’s. But it’s interesting how the title says “blue” and those examples say “azure.” The same principles apply, I suppose. – J.R. Oct 7 at 18:32
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These are inversions of word order typically used with colors to be emphatic or poetic but referring to other objects. What predominates in all these of these expressive inversions is precisely the color. These are used to emphasize the extreme nature of whatever the object and the color is. There is, as mentioned, the Beatles song, which also emphasize the color in this way.

They are not simple inversions like blue sky and sky of blue. A sky of blue, as in the song, can be used a simple inversion but a sky of blue could also refer to another object:

  • Her eyes were like skies of blue.

  • The jungle lay like a sea of green below us.

  • The buildings loomed like curtains of grey all around us.

  • The clouded sun weakened like burnt leaves of brown.

  • Night closed in around the cabin like a cauldron of black.

  • Songs rose in the morning light like arcs of white.

By using these, writers give a sense of depth to the color and objects they wish to describe.

Please note: a blue sea, where blue is an adjective. A sea of blue, where blue is a noun, not an adjective.

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In my point of view, if It's a poetic device then it is correct but I don’t prefer to use it because it is not common in everyday speech or even in writing.

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