Question: The Boxers is an outdoor 1987 steel and lacquer sculpture by an American artist and what?

Context paragraphs:
The Boxers (sculpture): The Boxers is an outdoor 1987 steel and lacquer sculpture by Keith Haring, installed in Berlin, Germany.

Jammin' on the Avenue: Jammin' on the Avenue is an outdoor sculpture by American artist John Spaulding.  It is located on the border of the Indiana University-Purdue University Indianapolis (IUPUI) campus, which is near downtown Indianapolis, Indiana, at the intersection of Indiana Avenue, North Street, and Blackford Street.  The historic Lockefield Gardens apartments flank the sculpture to its back.  Madame Walker Theatre Center is located across the street.  This sculpture is documented in the Smithsonian's Save Outdoor Sculpture!  database, which is the inspiration for this project.

Decanter (sculpture): Decanter is an outdoor 1987 sculpture by Frank Stella, installed at the Museum of Fine Arts, Houston's Lillie and Hugh Roy Cullen Sculpture Garden in the U.S. state of Texas.  It is made of stainless steel, bronze, and carbon steel, and was purchased using monetary contributions from the Alice Pratt Brown Museum Fund.  According to the museum, the piece "offers a exuberant collage of forms which bursts out into space".

Raven Gargoyle: Raven Gargoyle is an outdoor 1987 sculpture by Wayne Chabre, installed in 1988 on the University of Oregon campus in Eugene, Oregon, in the United States.  The hammered copper head of a raven with a Kwakiutl Indian mask, built on a stainless steel frame, measures approximately 4 ft x 3 ft x 4 ft .  It was surveyed and deemed "treatment needed" by the Smithsonian Institution's "Save Outdoor Sculpture! " program in March 1993.  The sculpture is administered by the University of Oregon.

Salmon Gargoyle: Salmon Gargoyle is an outdoor 1987 sculpture by Wayne Chabre, installed in 1988 on the University of Oregon campus in Eugene, Oregon, in the United States.  The hammered copper head of a salmon with Kwakiutl Indian representation on its sides, built on a stainless steel frame, measures approximately 5 ft x 3 ft x 8.5 ft .  It was surveyed and deemed "treatment needed" by the Smithsonian Institution's "Save Outdoor Sculpture! " program in March 1993.  The sculpture is administered by the University of Oregon.

The South Tower (sculpture): The South Tower is a stainless steel outdoor sculpture depicting the South Tower of the World Trade Center the moment before it collapsed during the attacks on September, 11, 2001.  Created as a tribute to the and designed by American artist Don Gummer, it is located on the Indiana University-Purdue University Indianapolis (IUPUI) campus, near downtown Indianapolis, Indiana, and owned by the artist.  The sculpture is made of frosted stainless steel aluminum.

Monumentalment IV: Monumentalment IV is a public sculpture by American artist Gary Freeman.  Commissioned in 1979, it was installed in 1981 on the grounds of the Indianapolis Art Center, formerly the Indianapolis Art League, in Indianapolis, Indiana, United States.  The sculpture was surveyed in 1992 as a part of the Smithsonian's Save Outdoor Sculpture!  program.  In the mid-1990s the work was relocated to the west side of the IAC's grounds and became part of its ARTSPARK, an outdoor sculpture garden.

Untitled (Rückriem): Untitled is an outdoor 1987 granite sculpture by Ulrich Rückriem, installed outside the Art Institute of Chicago, in the U.S. state of Illinois.

Unfolding Rhythms: Unfolding Rhythms is an outdoor 1987 sculpture by Manuel Izquierdo, located in Portland, Oregon, United States.

Keith Haring: Keith Allen Haring (May 4, 1958 – February 16, 1990) was an American artist and social activist whose work responded to the New York City street culture of the 1980s by expressing concepts of birth, death, sexuality, and war.

Supporting paragraphs: The Boxers (sculpture) Keith Haring
Answer: social activist