Pool of awesome design protruding from the roof

At the Hotel Avalon in Gothenburg, Sweden, the tip of the pool is popping out from the rooftop. Apparently this pool of designs are dotted around the world.

So, I gathered a pool of this design which partly jumped out of the building.
Looking up from the pool above, it looks like this.


Hotel Elan in the state of Dallas in the USA


From the bottomLooks like this

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Hilton Hotel in Auckland, New Zealand


It seems that there is also Adelphi Hotel in Australia


It is quite high, is not it. It seems to be 9 stories.