4.Espejo-Urban installation consisting of a panel of variable measurements that would work as an exempt billboard or wall and it would be placed in the middle of a wide square partially obstructing the view across it. An image of the same square and from the same perspective is reproduced on the billboard so that, seen from a suitable vantage point and with only one eye, representation and real view will coincide. The image will not introduce any apparent change regarding the reality.