Name the piece of art above and its artist. What media did the artist choose for this piece and why?

This piece is by German artist Anselm Keifer, and is entitled, Heath of the Brandenburg March. The artist chose to use a mixed media of oil, acrylic, and shellac, which he painted onto burlap. The artist was coming to grips with his country and its past. He wanted to create a piece that was rough and would convey a message of anguish.

i believe their role is to instruct certain sections on when they are to join and when they are to stop