Carrer del Milanesat, Sant Gervasi de Cassoles

On an overcast day in December, soon after passing the parabolic (or catenary?) arches* of the Collegi de les Teresianes (Gaudí 1888-89), and peculiarly close to my encounter with the leaf on C. del Doctor Roux.
* See for example Santiago Huerta's article in Architectural Science Review (2006).