Part of Ellsworth Kelly's landmark suite 'The Chicago Panels' (1989–1999), this black panel is one of six monumental shaped reliefs conceived for the Rice Building at the Art Institute of Chicago. Rotated 45 degrees into a diamond orientation, the work exemplifies Kelly's ambition to integrate painting with architecture — color as structure, shape as interval, wall as field. Its deep, uniform black surface and irregular curved edges create a commanding presence that oscillates between object and atmosphere. The ensemble is held in the permanent collection of the Art Institute of Chicago and is widely regarded as one of Kelly's most lucid architectural realizations.