A series of gaps on each level with 6 ducts permits natural ventilation, working the same way as double-glazed windows. The ducts cool down the air in summer, removing hot air from the building, and warm it up in winter. They also let more light in, saving on lighting costs. Systematic control of the indoor microclimate and energy-saving solutions cut the amount of energy normally needed for a building of this size by half.
But let us go over the history of the Swiss Tower, also known as "The Gherkin". The building stands on the former site of the Baltic Exchange, a company concerned with the charter and sale of ships. When an IRA bomb destroyed the building in 1992, restoration was considered, but it turned out to be impossible to restore the old building.
Not until 2000 did the authorities agree to permit construction of a new building.