To the editor: Your article on the DIY house built by homeless immigrants in Highland Park vividly brought to mind the various favelas I saw in Rio de Janeiro many years ago. Many of them were intricately constructed of several different materials, some with a great deal of skill and artistry. And I could not help wondering at the time how there was such a disparity in that city between the extremely wealthy and so many poor people living in these shacks. I keep wondering the same thing now. If... Read this story