From Dubai-based architecture firm ZN | Era comes this interesting proposal: The Downtown Circle, a massive elevated circular structure that would surround the Burj Khalifa. (Think supersized version of Apple's headquarters, in a configuration ill-suited for acrophobes.)

"As a response to the dilemma of how to build densely while retaining liveability, the Downtown Circle project establishes a sustainable and a self-sufficient vertical urbanism. As a singular mega building complex, it aims to create a hyper efficient urban center that gives back to the environment. The proposed 550 meter tall mega structure offers an alternative to the singular and unconnected high-rises found in most metropolitan areas."

"The Skypark: Different natural scenarios and climates are recreated inside the continuous skypark, forecasting a lively journey to the visitors and residents. They can experience the canyons, sandy dunes and plants from various floras. Swamps, waterfalls and tropical vegetation or the digital caves, cascades, fruit-trees and flowers of various hues and species together enrich the green ecosystem."

"A fleet of suspended peripheral pods transport passengers from one node to another in the Downtown Circle. These suspended vessels travel through a network of rail at the bottom tier to get to their destination."

"The environmental performance of the external louver system is optimized by varying the density of the louvers from one area of the facade to another in response to solar orientation and the self-shadowing that results from the building geometry. This geometry and the architecture of the facade in combination with the play of shimmering light effects from the surrounding water contributes to the compelling atmospheric and iconic quality of the @downtowncircle. The elevated heliport located on the roof of the inner ring provides transportation to all inhabitants."

For reasons unknown, the project is only listed on ZN | Era's Instagram page and not on their website.