The National Art Center, Tokyo

Listen first. The air inside here has a soft, open hush, the kind you only find under a very high ceiling. Light comes through a long wall of glass that curves in and out like a slow wave. Shadows of the glass frame fall across the floor in thin grey stripes. Somewhere above you, cups clink and people speak quietly. And two enormous cones of concrete rise from the floor, wide at the top, narrow at the base. Welcome to the National Art Center, Tokyo.

In Japanese, the building is called Kokuritsu Shin-Bijutsukan. That translates roughly as the New National Museum of Art. The word new matters. This institution opened in January 2007, which makes it young by the standards of national museums. It sits in Roppongi, in the Minato ward of central Tokyo. The district is better known for nightlife, embassies and glass office towers. Yet here, a few minutes' walk from the busiest crossings, the city opens up into trees, lawn and this rippling green-tinted facade.

Now for the first surprise. This national art centre has no permanent collection. None at all. You will not find a famous painting that lives here year after year. Instead, the building is designed to host exhibitions, many at once. Its exhibition space is among the largest in Japan. On any given day, one hall might hold a touring show of European masters, while another holds work by thousands of Japanese amateur and professional artists. The building is a stage, not a vault.

That second kind of show deserves a moment. Japan has a long tradition of art associations. These are societies of painters, calligraphers, sculptors and craftspeople that hold large annual open exhibitions. For decades they needed a big public space in the capital. This centre gave them one. So when you walk through some of the galleries, you may see walls packed with framed works, side by side, floor to ceiling. Families come to see a grandparent's painting. It is art as community, not only as spectacle.

The architect was Kisho Kurokawa, one of the best-known Japanese architects of the twentieth century. In his early career, he helped lead a movement called Metabolism. Its members imagined cities that could grow and change like living organisms, with parts that could be added or replaced. His most famous early work was the Nakagin Capsule Tower in Ginza, a stack of small boxy rooms, which was taken down in 2022. This centre came near the end of his life. Kurokawa died in late 2007, the same year it opened.

Look again at the glass wall. It does not run in a straight line. It swells outward, then pulls back, along the whole front of the building. The curves are not only for beauty. The glass and its fine horizontal louvres help control the strong sunlight and heat that fall on this side. So the wave works as a kind of skin, softening the light before it reaches you. Walk slowly along the inside of it, and notice how the pattern of shadow shifts with every step.

Between the glass skin and the gallery blocks is a vast atrium. This is the space you are probably standing in now. It is public, open and full of air. People come here simply to sit, to read, to meet a friend. Kurokawa often spoke about creating spaces between inside and outside, between nature and the city. This atrium is exactly that. You are under a roof, yet the trees outside feel very close, and the sky stays visible through the glass.

And then there are the cones. Two great inverted cones of concrete stand inside the atrium, balanced on their narrow tips. On top of the larger one sits a restaurant. On top of the other sits a café. Diners eat on a round platform, high above the floor, looking across the glass wave and out to the trees. From below, it looks almost impossible. Here is a detail many visitors miss: stand directly under one cone and look up. The shape seems to hang in the air.

The ground under your feet also has a deeper story. Before this centre existed, the site belonged to the University of Tokyo, which used it for an institute of industrial science. Earlier still, the land was connected to a military barracks of the Imperial Japanese Army. When the new building went up, part of the older structure was kept rather than erased. Look for it near the edge of the grounds. It is a quiet reminder that modern Tokyo is built in layers, each one sitting on the one before.

This centre is also one point in a wider triangle. Within walking distance you will find the Mori Art Museum, high in a tower at Roppongi Hills, and the Suntory Museum of Art, at Tokyo Midtown. Together they are often promoted as the Art Triangle Roppongi. Each place has a different character. Mori is high and contemporary. Suntory focuses on Japanese art and craft. This building is the broad, open public hall between them. Many visitors walk the triangle in a single afternoon.

Before you leave, take the stairs or escalator down to the basement level. There you will find a museum shop that focuses on Japanese design. It sells small, carefully made objects — stationery, tableware, textiles and playful gifts. It is a good place to see how Japanese makers think about everyday things. Upstairs, there is also an art library, open to the public, where you can browse catalogues from past exhibitions. Both spaces are calmer than the galleries, and both are easy to miss.

If you arrived by train, you may have come through a direct passage from Nogizaka Station. That tunnel brings you almost to the door, which is very welcome on a rainy day or in the heavy heat of a Tokyo summer. If you came on foot from Roppongi, you passed through quieter streets, small shops and the green edge of the grounds. Either way, the approach is part of the experience. The noise of the city drops away gradually, and the building appears through the trees.

So take one more moment here. Look at the light on the floor, and at the slow curve of the glass. Watch someone at the top of a cone lift a cup of coffee, far above the crowd. Notice the paintings waiting beyond the gallery doors — shows that will change next month, and the month after. Nothing here is meant to stay the same for long. As you walk out under the trees, turn back once. The glass wave will be holding the sky.