Zig-zagging between the south and north sides, the windows tell the story of faith by traveling through the Church's liturgical year, from the first Sunday of Advent (at the back of the nave) to Pentecost (at the sanctuary), except for three sets of panels in the middle section, which deal with the Church, the Sacraments and the Christian family. The stone panels gracing the faces of the buttresses continue the story. Intertwined with this are Saints. - Find the bay at the first buttress (hint: inside the first arch on the left).