For anyone who has lived or visited a narrow courtyard wrapped in buildings it can sometimes be a claustrophobic space with the sky limited in all directions, but the strange geometric gaps formed by the surrounding architecture are often fun to photograph. For instance art director Lisa Rienermann (scroll right) became famous for her award-winning alphabet formed from letters spotted in the space between buildings. However French artistThomas Lamadieu instead used the constraints as inspiration for his imaginative illustration series Sky Art, where the artist drew within the narrow confines of rooftops and tiny slices of sky to create some pretty wild imagery. It would be fun to see several artists interpretations of the exact same spot. (via my modern met)