'deFENCE' is an interactive conceptual art project for freedom of cohabitation, designed in such a way as to include each beholder personally. In tradition of Marcel Duchamp, the two main roles of this exhibit are the work itself, and the person watching it. Only here, the subjective role of the beholder is not the only one. They are personally drawn into the exhibit, by way of a mirror. The work represents a house, with its door wide open, inviting and welcoming every visitor. Except, a certain visitor is watching this house over a barbed wire fence. On the other hand, this visitor is being watched from the window of the house. The author's intention was to combine these two persons into one, so that people who had never had the chance to be on the other side of the barbed wire, can benef