The starting point of Laurence Aëgerter’s facsimile Cathédrales, is the 1949 catalogue Cathedrals and churches of France, published by the Ministry of Public Works, Transport and Tourism. The artist placed the book by the window in her studio and allowed the incidence of natural light to impact a reproduction of the façade of the Saint-Étienne cathedral in Bourges. She photographed the book every minute during two hours, obtaining 120 photographs of light variations upon this unique image. The play of shadow and light of the Gothic architecture in the orignal photograph, is superimposed by a new shadow that slowly glide on the cathedral and, imperceptibly but irreparably, swallows it up. Aëgerter’s photographs contain thus three stratified layers of times : the 12th century, 1949 and 2012. Cathédrales presents a photographic sequence and as we turn the pages, we are aware of the temporal dimension of this visual exploration, a metaphor of transcience.