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I first happened upon this marvel of engineering on this recent CNN Travel video story. Digging around the internet, I then found this late April story on CNN.
London's new see-through Sky Pool is first of its kind:
The Sky Pool is a 82-foot (25-meter) transparent swimming pool stretched between the 10th stories of two residential skyscrapers in southwest London's Nine Elms neighborhood -- and it's only open to the apartment complex's lucky residents[*].
[...] The pool was put through extensive strength testing at the Reynolds factory [in Colorado] before making its journey to the UK by road and sea. It was then lifted into place by a 750-tonne mobile crane, supported by a 50-tonne crane.
[...] "After a series of technical drawings and behavioral analyses, the dimensions of the pool were decided," says the Embassy Gardens website."
With sides 200 millimeters [(7.9 inches)] thick and 3.2 meters [(10.5 feet)] deep, and with a bottom 300 millimeters [(11.8 inches)] thick, the 50-tonne acrylic pool will span the 14 meters [46 feet] between the buildings, with steps and filtrations systems sitting either end, and five modes of lighting to add to the feeling of magic."
[...] "Once you swim off, you can look right down. It will be like flying," says Brian Eckersley, director of Eckersley O'Callaghan.
[*] a two-bedroom unit starts at just over £1 million (~$1.4 million).
Entry on Wikipedia.
(Score: 3, Informative) by DannyB on Tuesday June 08 2021, @04:45PM (3 children)
On a Dyson sphere, you are on the inside. Gravity is due to the spin of the sphere. At higher (and lower) latitudes the "pull" of the "gravity" (due to spin) is at an increasing angle from "straight down" where you are standing, and at lower and lower force as you near the poles. At a pole the force is zero and at 90 degrees from "down" (eg where you are standing).
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(Score: 2) by mhajicek on Wednesday June 09 2021, @05:12AM (2 children)
Dyson spheres are built around stars, which have gravity. Yes, you could spin it, to bring effective gravity to or below zero at the equator, but then it would be unbalanced and require even stronger materials. Gravity at the poles would still be full force in either case.
The spacelike surfaces of time foliations can have a cusp at the surface of discontinuity. - P. Hajicek
(Score: 0) by Anonymous Coward on Wednesday June 09 2021, @07:50PM (1 child)
Gravity from the star yes, but that would pull you into the "sky" of the Dyson sphere. Even with the massive structure of the sphere itself the gravity inside would be zero because the rest of the sphere not directly under your feet would exert an equal force. So centrifugal fake gravity is all you could use unless we figure out some better science.
(Score: 2) by mhajicek on Wednesday June 09 2021, @09:57PM
You are assuming the observer to be on the inside, which makes no sense. You could only stand on the inside if it's spinning faster than needed to cancel it's weight, and then only near the equator. That would make most of the sphere useless. Spinning it would also require far stronger materials, making it even less practical. Make it stationary, and you only need moderately magical materials, and you can use the whole outside of the sphere.
The spacelike surfaces of time foliations can have a cusp at the surface of discontinuity. - P. Hajicek