The Triangle Shirtwaist Factory fire in New York City on March 25, 1911, was the largest industrial disaster in the history of the city of New York, causing the death of 146 garment workers who either died from the fire or jumped to their deaths.
The Triangle Shirtwaist Company, owned by Max Blanck and Isaac Harris, occupied the top three floors of the ten-story Asch Building in New York City at the intersection of Greene Street and Washington Place, just east of Washington Square.
Someone took the time to go around the neighborhood and honor the factory workers, most of whom were young immigrant women.
I don't know who takes the time to arrange all this (I saw five of these chalk tributes today...) but I'm glad that they do it...