David Adjaye's upside-down supertall skyscraper proposal for New York has raised eyebrows, but it's not the only tall building that increases in size as it rises. Here is a roundup of 10 other top-heavy buildings.

Vancouver skyscrapers by Heatherwick Studio
UK-based Heatherwick Studio designed two irregularly-shaped towers that, when built, will grow upwards from a bottleneck into tall structures studded with balconies. The high-rise buildings are planned for Vancouver and will feature clusters of plants on their balconies, which many of the British architecture firm's recent skyscrapers also do.
Find out more about the Vancouver skyscrapers ?

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