ArtworkWhat is Gravity? (Was ist Gravitation?)Sign in to saveA.R. Penck (Ralf Winkler) — (1984) — Aquatint and drypointArtwork · Museum of Modern ArtAquatint and drypointArtistA.R. Penck (Ralf Winkler)Date(1984)MediumAquatint and drypointView at Museum of Modern Art · Open Access