In Mauritania, northwestern Africa, slavery is a fact of modern life. It's estimated that 10-20 percent of the country's 3.5 million people are still enslaved in a system rooted in ethnic discrimination.
The book "Walls of Freedom" presents readers with images of the street art of the Egyptian Revolution of 2011. The English-language photo book is published by the activist and street artist Don Karl (aka Stone). In Egypt, the work has fallen victim to censorship. Wafah Al-Badri offers his impressions of "Walls of Freedom"