However, it is the East tower's striking form, with its cantilevered platforms, that has transformed the skyline. The platforms have a highly functional role in terms of bringing natural light down into the park, and the retail centre below.
"The smaller west tower has 40 6.2m² heliostat panels on top, which track the sun during the day," says Giles. "Sunlight falling onto these reflector panels is bounced back up to 320 0.8m² fixed reflector panels cantilevered off the taller east tower. These panels reflect the light back down, with 40% of the light falling onto a large skylight over the retail centre.
"This skylight has a shallow pool of water over it, so the light shimmers down into the atrium, giving it an ephemeral look. Plants in the atrium thrive on that reflected light. The remaining 60% of the light from the reflector frame is directed down into the southern plaza."
The heliostat is believed to be the first of its kind to be used in a residential context in Australia, and the largest of its type in the world used in an urban environment. By night, the reflector frame becomes a giant LED-illuminated multicoloured artwork, titled Sea Mirror, by artist Yann Kersale.
The monumental form of the tower is further enhanced by the green walls that feature throughout One Central Park. Designed by French botanist Patrick Blanc, the vertical gardens cover more than 1200m², across 23 panels.
"Every side of the building has a different microclimate that needed to be taken into account with the plant selection," says Giles. "Plants were also chosen to flower at different times of the year, which is why there are 383 species, both indigenous and imported. These all help to create a discernible tiering of green, like a ribbon that winds up the building. The plants are watered by a gravity-feed system that pumps recycled water up to the top of the building, where it is enriched with nutrients, then drip-fed back down the facade."
The greening of the building continues on the top of the podium, which is a recreational area for residents. This features landscaped gardens, a long swimming pool and a number of Jacuzzis.
The Level 29 Sky Garden on the cantilevered deck is another amenity for residents of the Sky penthouses and sub-penthouses. The garden is accessed through a darkened passage that opens into an area washed with bright orange-red glass.
"This is a transition zone that heightens the sense of anticipation," says Giles. "The natural daylight is a burst of colour at the end of the walkway, where you emerge to find yourself out on the cantilevered platform at the top of the building. This area is also beautifully landscaped, with gardens and a Jacuzzi."