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There is no reception desk to greet visitors to the new Maggie鈥檚 Centre at Swansea鈥檚 Singleton hospital. Instead there is a log fire and a large kitchen table, complete with well-stocked kitchen. Tubular steel and hospital green are notably absent. No wonder the first thing visitors tend to do when they arrive is relax, sit down and have a cup of tea.

This is, of course, the whole idea. Maggie鈥檚 Centres were conceived by the late writer and garden designer Maggie Keswick Jencks and her husband, the architectural critic Charles Jencks, to offer cancer patients non-medical support within a restful and pleasant environment away from the harsh functionality of hospital. The centres - Swansea is the 13th to be completed - have been designed by a who鈥檚 who of international architecture (see box, below), and the latest comes from a concept design by the late Kisho Kurokawa, one of the founders of Japan鈥檚 postwar metabolist movement.

The metabolists鈥� vision seems to fit neatly with the Maggie鈥檚 philosophy, their buildings being far more organic than the functional and mechanistic European modernism of the same era. And the Swansea centre follows in this tradition, using concrete to create a fluid, natural structure that is also reassuringly solid.

Thore Garbers, who with partner Wendy James was executive architect for the scheme, says: 鈥淚 felt the centre needed a weight, a permanence. Some of the buildings you see around hospitals look like they could be blown away by the wind. Some actually are temporary. We wanted something different.鈥�

The centre鈥檚 robustness, says Garbers, creates the feeling that those inside are protected, and from more than just the weather which sweeps in from Swansea Bay. 鈥淪ee the centre in the evening,鈥� says Garbers, 鈥渨ith the light shining out through the windows, and it is something like a castle. You know that inside there is warmth, light - safety, if you like.鈥�

In fact there is much about the design of the centre which works to give the building its kindly aspect. The exterior concrete, for example, is inset with hundreds of triangular titanium plates that sparkle in the sunshine or, perhaps more likely in South Wales, glisten in the rain. But most obviously it is the centre鈥檚 extraordinary shape: a vortex or swirl on plan - two tapering dragon鈥檚 tails snaking left and right in elevation - which amuses rather than threatens. Curves are everywhere, and they substantially soften the building鈥檚 appearance.

The foundations at least were pretty straightforward, says Garbers. 鈥淭he site was previously occupied by four small doctor鈥檚 residences which had been constructed on a filled bank. Two were demolished to make space for the new centre and two were converted for use as a temporary place for Maggie鈥檚 to set up in.鈥�

鈥淪ee the centre in the evening and it is something like a castle. You know that inside there is warmth and light.鈥�

Thore Garbers

Main contractor Sir Robert McAlpine poured the floor slab in late autumn 2009 and then set about constructing an in-situ reinforced-concrete frame comprising columns and a ring beam at first-floor level. A first-floor slab was then cast with a large cut-out for the elliptical central entrance area with its wide curving staircase.

The 56 precast panels that clad the centre, cast in a self-compacting concrete with a pale cement and limestone mix to give a light, smooth finish (see box, left) were installed in June 2010.

Garbers says: 鈥淭o prevent cold bridging between the frame and wall panels we covered the frame in 50mm of rigid insulation. Delivery of the panels was carefully timetabled because, this being a hospital site, you can鈥檛 have lorries queuing up and blocking the entrances. It worked very well and we dropped them into place in just two days.鈥�

Behind each precast panel is timber studding and 100mm of Kingspan insulation. The interior is painted plasterboard.

Considerable effort went into the panels鈥� titanium decoration. 鈥淓ach plate had to curve with the radius of the panel,鈥� says Garbers. 鈥淚n all, there are nine different shapes, but these are flipped and rotated to give the appearance of many more.鈥�

The titanium plates fit into shallow recesses in the concrete, and these were cast into each panel by fitting into the moulds pieces of acrylic sheet, cut to match the titanium. 鈥淚t required a lot of coordination between us, the precaster and the US-based titanium manufacturer.鈥�

The roof also required a bespoke approach. Garbers explains that a long tubular steel spine runs from the end of one dragon鈥檚 tail to the other via an elliptical loop, which supports the roof around a central circular rooflight. 鈥淭imber rafters come off this spine like fishbones, and these were covered by a plywood 鈥榮tress skin鈥� before the zinc cladding was applied. We then blew particle insulation into the voids between the rafters through specially drilled temporary holes.鈥�

Inside, the interior is surprisingly efficient and practical. Within the 鈥渢ails鈥� on the ground floor are two large multi-purpose spaces which are used for anything from yoga classes to meeting rooms. Nearer the heart of the building are two smaller counselling rooms and two WCs. The first floor is somewhat smaller, due to the slope of the tails, but there is still room for an office, a small counselling room and a library. There is also a panoramic window looking out to sea - a popular spot where people can simply sit, rest and enjoy the view.

鈥淵ou can actually see the effect this building has on people as they walk through the door,鈥� says the centre鈥檚 head, Debbie Horrigan. 鈥淭heir shoulders relax and they almost sigh with relief as they walk into a building that is spacious, light and airy.

鈥淎nd the funny thing is that it doesn鈥檛 matter whether it is fully occupied and busy, or with only a few people around, it is always a calm, comfortable place to be. It鈥檚 got a lovely vibe about it.鈥�