and the light shining through the optically reflective space of the remaining windows. The pictorial space of each image was directed at different points on the ground where the sun reflecting in the windows was visible. The viewing angles changed throughout the year as the sun's elevation in the sky changed. In addition to the 48 outer window grids, there were also 48 grids facing inward, directly opposite the outer grids. They didn't reflect the light of the sun from any possible viewing angles on the street, but the artist worked with them as well, using morse code to embed messages in the window grids. The window grids were already in various stages of decomposition when Wulsin found the building, with almost a third of the total number of windows already broken out by inmates during various prison riots when the jail was still in use. The cycle of appearance and disappearance that took place according to the daily, monthly and yearly lunar and solar cycles, and the position of the potential viewer was underscored at a larger magnitude by the demolition process, which consisted in the removal of the building from the top down, floor by floor. The demolition lasted until March 2008, with the majority of the rubble taken to a fill in the River Plate at Costanera Norte near Jorge Newbury Airport. After discovering the prison in January 2006, while exploring the neighborhood of Parque Patricios, where he'd recently moved from New York City, Wulsin spent four months navigating the bureaucracies of the national and city governments of Argentina and Buenos Aires, respectively, to gain authorization to enter the building and carry out the onsite work. The resolution authorizing the project was finally signed on Friday, June 16 (Bloomsday), 2006 by Minister of Public Works of the city of Buenos Aires, Juan Schiavi. The security tarp made by Wulsin to direct broken glass back inside the building was blue and white, and painted with the hot air balloon logo of the local Parque Patricios soccer team Huracan. The five weeks of onsite work were completed on Marcel Duchamp's birthday, July 28. But the project itself was ongoing through the entire demolition process of the building. Gallery See also Caseros Prison External links 'City government authorization for the project' Buenos Aires City government description 'The Guards of the Mafia', Pagina 12 'Cement Hell', 30 Noticias 'The Cruel Ones