An Entrance to the Paris Métropolitain by Hector Guimard https://www.nga.gov/artworks/108510-entrance-paris-metropolitain
Architect Hector Guimard was the principal designer of the Paris Métro system, which opened in 1900 at the time of the Exposition Universelle. His work is associated with art nouveau, a style of art and architecture that is based largely on organic forms from nature.
Art Parks: A Tour of America’s Sculpture Parks and Gardens.
