 Some of the most important works in the Metro include the stained-glass window at station, the masterpiece of major Quebec artist Marcelle Ferron; and the Guimard entrance at Square-Victoria-OACI station, largely consisting of parts from the famous entrances designed for the Paris Métro, on permanent loan since 1966 by the RATP to commemorate its cooperation in constructing the Metro.Installed in 1967 (the 100th anniversary of Hector Guimard's birth), this is the only authentic Guimard entrance in use outside Paris.The Montreal Metro had been a rather late adopter of accessibility compared to many metro systems (including those older than the Metro), much to the dismay of accessibility advocates in Montreal.