Always very minimal with few images, without big special effects, often without text, with a very estimate sound, the common works of Nina Kovacheva and Valentin Stefanoff (mainly video and sonic installation) drive the spectators to pose himself a basic questions about existence in the contemporary world. Many of their recent video installations are intended to the façades of different museums and public buildings. For the video installation "In the Out" which is in the same principle they was awarded a "The 2002 UNESCO Prize for the Promotion of the Arts".