"I prefer working by artificial light."
Frank Herbert loved the sea, having written books about it before his Dune series established him as a science fiction writer. Designs for undersea dwellings usually included air-filled tubes connecting different buildings; the use of a water-filled tube connecting land dwellings of amphibians is a great inversion of the idea.
As always, the invention serves to emphasize the alien nature of the Gowachin, a frog-like people that are just one of the interesting alien races in this novel. All Gowachin keep a graluz, a pond for fertile females and offspring. Herbert spends a lot of time in the novel exploring the idea of what a sentient frog might be like; would males feel guilt when (as in nature) eating the slowest and least fit offspring? The Gowachin prided themselves on staying true to their animal nature and heritage while achieving a high level of civilization.
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ESA Space Claw To Grab Space Junk
Now, where have I seen this idea before?
Airport Security Now Using Predator-Style Heat Vision Helmets
'Want some candy?'
'Black Friday' Online Shopping - In 1899!
'In your days they showed you a fashion-plate,' said the tailor, 'but this is our modern development.'
DARPA's Virtual Caves Explored By Virtual Robots
'If there's anything in here worth looking at, these pups'll find it.'
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'They will have flung great arches and domes of glass above the wider spaces...'
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Robots make art for man.
Looking Glass Display Good Enough For Science Fiction, Fantasy
'The figure seemed to be swimming toward the surface.'
Do You Need The Entire Fembot? Maybe Just The Hand
'...Men don't want real women anymore. You and I are behind the times...'
3D Printing With Sunlight And Sand
'We made a crude, small cell and were delighted...'
Samsung Gets Transparent Smartphone Patent
The Transparency of Things to Come
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