Is it possible to create objects in one namespace from another?

For example, if I am in the global namespace and I want to create an object in the config namespace, can I do it, and if so how?

The obvious appears to be something like this to me:

Code PHP:
namespace {
    config\$object = new config\class();
}

This isn't working for me however. Am I doing something wrong or is it just not possible?

I get this error:

Parse error: parse error, expecting `T_STRING' in...