Just a pool, disguised as a pond, with a trampoline instead of a diving board.
I wrote a paper about these kinds of pools several years ago for a class when they were just prototypes. These pools have a natural filtration system that run based on the plants that are in the pool that give the water nutrients that allow it to not only be crystal clear, but you are also able to drink the water because it becomes so clean. And the best part is that once the initial filtration system is installed and calibrated, it maintains itself and eliminates the need for chlorine or constant maintenance like salt water pools.
Norman Bel Geddes, Motorcar No. 9, 1932. Drawing, blueprint, rearview and model without tail fin, 1933. © Edith Lutyens and Norman Bel Geddes Foundation.
It offered excellent visibility through the use of curved glass for the windshield and windows. The steering wheel and single headlight were in the center. The car featured a vertical stabilizer, like an airplane. The bumpers were made of chrome. More: Source
Villains who twirl their mustaches are easy to spot. Those who clothe themselves in good deeds are well camouflaged.