i'm stephen sackur and this is the vast turbine hall in london's tate modern gallery.has been home to a series of installations by some of the world's leading contemporary artists, and right now it is showing a work by my guest today, the cu ban conceptual artist, tania bruguera. her installations and performances have won her acclaim right around the world. also, they have prompted harassment, censorship and detention inside cuba. so is she an artist, activist, or maybe both at once? tania bruguera, welcome to hardtalk. here we are in the tate modern gallery. it is stuffed full of things, of paintings, sculpture, and yet you as an artist seem much less concerned about things, much more focused on ideas. would that be fair? absolutely. i think the work i do as an artist is focused on gestures, i want to do political gestures, institutional gestures, human gestures, and i always feel that some things are invisible. and in a sense, it strikes me that the tools of your art are people, both yourself but also the viewers, the audience as well. rather than paint or material,