Macumber, the blue-eyed giant is a legendary being in Westeros, the kind of folktale creature in children's stories.
According to some stories, the reason the sky is blue because the entire world is a tiny object floating in the eye of a cosmically immense, blue-eyed giant called "Macumber".
This, as with much of the story (including the very reference to 'ice and fire') is a reference to the Norse creation myth as outlined in the Hávamál, specifically the giant therein is named Ymir in the same way J. R. R. Tolkien used Anglo-Saxon myth for his Rings series.
As Old Nan leaves Bran Stark's bedside, Robb Stark remarks of her many fairy stories that she once told him that the sky is blue because we all live inside the eye of a blue-eyed giant named "Macumber". Bran points out that for all anyone knows, maybe everyone does.
- Tywin Lannister: "Some believe the king choked."
- Oberyn Martell: "Some believe the sky is blue because we live inside the eye of a blue-eyed giant. The king was poisoned."
- — Oberyn refers dismissively to the fairy-story about Macumber the giant.[src]
Soon after the assassination of King Joffrey Baratheon at his own wedding, his grandfather Tywin Lannister meets with Oberyn Martell. Tywin remarks that some (naive) people think that Joffrey simply choked. Oberyn flippantly replies that some people think the sky is blue because we all live inside the eye of a blue-eyed giant (but thinking it doesn't make it true). Oberyn acknowledges that Joffrey was assuredly poisoned.
In the books
In the A Song of Ice and Fire novels, there is no mention of any character named Macumber, or of a legend about the sky being blue because the entire world is in the eye of a blue-eyed giant named - nor any comparable fable. It is an invention of the TV series.
The on-screen subtitles confirm that the spelling is "Macumber" not "Macumba".
Through study of astronomy, maesters and other learned men of the world have actually determined that the world that the continent of Westeros is set on is much like real-life Earth: a round globe circling the sun through outer space, along with several other planets. So just to be clear, there is no chance that the legend about Macumber is actually true... or at least, the part saying that this world's sky is blue because it is in the eye of a blue-eyed giant. As for whether the entire universe is inside the eye or head of some higher being, no one knows. Still, the story about Macumber is apparently not a meta-narrative reference to author George R.R. Martin (in the sense that the entire world of Westeros originated inside of his head): Martin has brown eyes.
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