The first design challenge is to give this pivotal new park a real presence at an urban scale. Because OCP is a high rise, it is possible to bring the park up into the sky along its facades and make it visible in the city at a distance. On the South side, the park rises in a sequence of planted plateaus that are scattered like puzzle pieces in randomized patterns across the facades, so that each apartment has not only a balcony, but also its own piece of the park.

At the individual scale this creates pleasant private gardens and at a collective scale, a green urban sculpture. In this way, the building offers a flower to each resident and a bouquet to the city. On the North, East and West sides, the green takes more continuous veil-like appearances with green walls, continuous planter bands and climbing vegetation. The plants deliver a message of sustainability, and because their shade reduces energy consumption for cooling and their leaves trap carbon dioxide, they also effectively make the building more sustainable.

The second design challenge arises from the tall massing along the North side of the site. In order to remediate overshadowing of the park, the volume is broken up into a lower and a taller tower. On the roof of the lower tower, 42 heliostats (sunlight tracking mirrors) redirect sunlight up to 320 reflectors on a cantilever off the taller tower, which then beam the light down into areas that would otherwise be in permanent shade.

The system adapts hourly and seasonally to the need for brightness and warmth, so that the dappled lights move on the ground in a precisely programmed choreography. At night, the heliostat becomes a monumental urban chandelier and appears in the dark sky like a floating pool of tiny LED lights that merge into a giant screen and simulate reflections of glittering harbour waters.