I don't know exactly what makes a artist most admirable: if is his artwork or the efforts and risks he takes to realize it. Well, Blu probably has this two caracteristics, making giant artworks on high buildings, walls and big structures around the globe. They may be beatiful and well done, however probably the main purpose of his paintings it's to share a strong opinion about some delicated issue like polution, capitalism, poverty, war or global warming.
His dedication Is really impressive , since it's not that simple to make these colossal artworks and even to express opinions in this way. If you got interested in his works, please access his website to get in touch with some more content.