This week on Open Studio, Jared Bowen sits down with local artist Rob “ProBlak” Gibbs. He's known for his large-scale murals, which have been brightening up Boston neighborhoods for years. His latest work is “Breathe Life Together,” which he just completed on one of the city’s largest canvases: Dewey Square on the Rose Kennedy Greenway. A co-founder of the nonprofit Artists for Humanity, Gibbs is also known for his community activism as an organizer and mentor.