The initial Kirby comics depict boom tubes as a sort of quasi-technological equivalent of Bifröst, the Rainbow Bridge linking Asgard and Earth; indeed, boom tubes are described as a "bridge to Earth."
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Writer Peter David introduced the idea in Supergirl Vol. 4, issue 29 that the New Gods were giants and that the Boom Tube would shrink them as they traveled to normal time and space or enlarge beings who traveled to the Fourth World realm.