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Never mind the gherkin here鈥檚 the Geyser

If ever a building was set to beget a tribe of offspring around the world, it is that icon of a turn-of-the-century skyscraper 鈥� Foster and Partners鈥� sleek, curvaceous Swiss Re tower in the City of London. The first and most eagerly awaited daughter, the Torre Agbar in Barcelona, is due for completion in July.

In shape these are peas from the same pod 鈥� well, more like cucumbers from the same branch. Yet to label Torre Agbar as a Swiss Re clone is not just Anglocentric but downright misguided. The architect, you see, is royal gold medallist Jean Nouvel of Paris, who is of the same supermodern persuasion as Foster but gives his buildings a more ambivalent, surreal, teasing, even gutsy twist.

The idea that Torre Agbar should be a tower or a skyscraper in the American sense is far too staid and static for Nouvel. Instead his surging imagination has conceived it as the manifestation of the most basic, powerful elemental forces. As well as a giant phallus on a city scale, he has described his tower as 鈥渁 fluid mass that bursts through the ground like a geyser under permanent, calculated pressure鈥�.

Not just volcanic and sexual forces but air, fire and water are expressed in Nouvel鈥檚 building. Its precision-engineered geometry is counterpointed by splashes of colour that are vivid, irregular and cover the whole exterior. Further up the tower, swathes of blue and blotches of white encircle much of the tower, as if it had been absorbed into the Mediterranean sky. Lower down, the skin erupts in huge red flickers, as if reflecting the sunset, or even a city fire. Elsewhere, the colour subsides into watery ultramarine and misty green washes.

Shimmering skin

At the same time, this huge all-round mural of vivid colours is tantalisingly veiled behind a diaphanous outer skin of tiny scales, or louvres, of clear glass. 鈥淭he surface of the building evokes water: smooth and continuous, shimmering and transparent,鈥� Nouvel explains. 鈥淚ts materials reveal themselves in nuanced shades of colour and light.鈥�

Well might Nouvel comment: 鈥淭he ambiguities of material and light make the Agbar tower resonate against Barcelona鈥檚 skyline day and night, like a distant mirage.鈥� Yet behind this sophisticated interplay of clear transparent outer skin and colourful opaque inner skin stands a practical, low-energy and remarkably basic piece of construction.

This singular object will become the new symbol of barcelona the international city

Jean Nouvel

In practical terms, the outer skin functions as a weather screen that tempers the effects of sun, wind and rain. The inner skin, which is partially protected, is faced in a cladding material most commonly seen in out-of-town industrial buildings 鈥� profiled aluminium sheeting. The opaque skin is punched through in a seemingly random pattern by standard square or rectangular windows, many of them openable by hand.

Directly behind the profiled aluminium sheeting stands an even more low-tech material 鈥� in situ reinforced concrete. What鈥檚 more, the concrete is not deployed in a craftily assembled structural frame but in its most low-tech form, as a solid load-bearing wall up to 500 mm thick. As well as supporting the 35 storeys of office space, the massive concrete wall that encircles the building acts as a heat sink to reduce artificial heating and cooling.

Inside the tower, the offices will be arranged in elliptical open-plan floors, with a compact core for toilets, services and stairs offset from the centre. The six main lifts do not form part of this core but are banked directly behind it along the eastern perimeter of the tower.

When we get to the top eight floors that form the parabolic apex of the tower, the massive concrete walls are replaced by a glazed shell. As this shell is a non-load-bearing curtain wall, the office floors are set back from it and are supported on internal columns.

M Nouvel is not a man known for excessive modesty. And so it is with this building, of which he says: 鈥淭his singular object will become the new symbol of Barcelona the international city.鈥�

Being the city鈥檚 most prominent, as well as its most alluringly shaped, coloured and textured, landmark, he may well be right.

As for those building designers around the world who will never visit Barcelona, the tower presents an ingenious new model for low-energy, high-rise buildings. So, not a clone of Foster鈥檚 Swiss Re tower, more a rival.