Portland, United States of America
Kerf is an outdoor series of two pigmented cast concrete sculptures by Thomas Sayre, installed at the MAX Orange Line's Southeast Tacoma/Johnson Creek station in the southeast Portland, Oregon portion of the Ardenwald-Johnson Creek neighborhood, which straddles the border between Portland (and Multn
omah County) and Milwaukie, Oregon (and Clackamas County). According to TriMet, the pieces were "earth-cast" on site and represent "the influence of wheels on the area, from a 19th-century sawmill on Johnson Creek to the wheels of the MAX train".
Listen to the audio guide for Kerf Free on WIP — starts by itself when you arrive, even with the screen off