 A fourth piece, issued as a later "one off" by the artist, was painted blue.The James Goodman Gallery in New York lent it to New York City, where it was installed in Battery Park in January 1996 near the site where piece #1 once stood.This work remained undamaged from the September 11 attacks of 2001, despite being only a block away, and was reportedly used as a message board by the Federal Bureau of Investigation during its investigation of the attacks.