Two small boys on tiny bikes ride single-file along a street, next to a paved sidewalk, a large tree, a wall of rough-hewn stone, and the entrance to what appears to be an apartment building. The boy riding behind is balancing several bulky items, including a large bottle of water, on his handlebars, and using his chin to keep them steady as he rides.

Express delivery, by Gauthier Delecroix (CC BY 2.0)