30 St Mary Axe has a circular plan and a profile that maximizes the public space at the base for terrace cafes and creates a glass bubble at the summit for 360-degree views. The triangulated glass skin is reminiscent of spirals found in nature.

• London’s first ecological tall building, consuming 20% less
  energy than a conventional tower.

• Profile captures the wind to encourage pressure differentials that drive natural ventilation.

• Spiraling atria create informal spaces – a natural social focus – and distribute fresh air drawn in through operable facade panels.

• Solar gain diverted by double-skin facade provides borrowed heating and cooling.

• Diagonally braced structure allows column-free floor space.

• Popularly known as “The Gherkin,” it has become a symbol of London and the UK.