Opus Office Tower, Abu Dhabi – Opus Office Tower, Abu Dhabi
According to its architects, a pixelated reflective façade will make the cube seem full during the day time. However, at night it "dematerializes" as specially installed lights flood the void.
Buildings with holes – Guangzhou Circle
The central void includes gardens, and is unique for a building of this size. The firm says the "inner hole is a unique space that has no equal in the world with its almost fifty meters of diameter." The total cost of the building was around 50 million euros.
La Grande Arche de la Défense – La Grande Arche de la Défense
In 1982 French president François Mitterrand staged an international design competition to create a "modern Arc de Triomphe". The Danish duo of Johann Otto von Spreckelsen and Erik Reitzel won with their Grande Arche de la Défense, which is meant to celebrate humanity rather than commemorate military conquest. Visitors don't just get a view of Paris through the Arc: there is also a viewing platform on its roof.