Earthquake building testing in Japan
One of Japan's richest men, the billionaire property developer Akira Mori, has called for a halt to the building of skyscrapers.
Since the devastating earthquake and tsunami in March, sales of high-rise apartments in Japan have plummeted. Some renters have even moved to lower apartments.
The BBC's Roland Buerk visited the Kajima Corporation's test facility - which simulates the effect of earthquakes on the country's buildings - and spoke to engineer Jun Tagami.