OpenCorporates | How complex are corporate structures?

OpenCorporates has a nice visualization showing "How complex are corporate structures?"

I'm not sure where jwz got this text from but...

These maps show the corporate networks of the top six banks in the USA. Each dot represents a company, and each line shows where a company controls another company. A "corporate network", therefore, is a network of control, with a single corporation at the top of the tree, ultimately controlling all the companies beneath it. We have grouped together companies that are in the same country, in the shape of that country. This gives you an idea of the size of the corporate network, and how it is structured. By comparing different corporate networks, you can see where and how different companies operate. If you want to understand how complex multinational companies are, consider this. In Hong Kong, there's a company called Goldman Sachs Structured Products (Asia) Limited. It's controlled by another company called Goldman Sachs (Asia) Finance, registered in Mauritius. That's controlled by a company in Hong Kong, which is controlled by a company in New York, which is controlled by a company in Delaware, and that company is controlled by another company in Delaware called GS Holdings (Delaware) L.L.C. II. ...Which itself is a subsidiary of the only Goldman you're likely to have heard of, The Goldman Sachs Group in New York City. That's only one of hundreds of such chains. All told, Goldman Sachs consists of more than 4000 separate corporate entities all over the world, some of which are around ten layers of control below the New York HQ. Of those companies approximately a third are registered in nations that might be described as tax havens.Indeed, in the world of Goldman Sachs, the Cayman Islands are bigger than South America, and Mauritius is bigger than Africa.