This blog entry on the leenk.me site contains an example of a proxri. Near the end he talks about giving 10% of his net revenues to the WordPress foundation. He talks about how WordPress is a community that makes a lot of other things possible.
In this example, the WordPress community is a key element of the proximity of his business situation. And he’s giving that 10% with the proximity in mind. Can you see how that 10% is a proxri? For more on proxri, see proxri.org.