They look like the futuristic Space Guerilla. From 18 March, they will make Kanairo unsafe. That is the Sheng name for Kenya's capital Nairobi. The venerable MacMillian Library in the centre will kick off the launch. It becomes a space station. They have camels with them with Massai blankets. The olive overalls are well tailored, the steel masks make them look martial. With this project, the Kairos Futura artists' group puts a big exclamation mark on Nairobi's Design Week. But it is not only about spectacle. The artists' collective, consisting of artists, designers, scientists and environmentalists, wants more: visions and proposals for an environmentally friendly Nairobi. It is about reclaiming urban space, about the "rewilding" of inner-city areas. They…