Functional Box 15 Year 1999 Medium boxes Materials acrylic, 22kt. Gold leaf, poplar, maple Dimensions 4″h × 6.5″w × 6.5″d ← Functional Box 13 (1999) Functional Box 8 (1999) → Related works Functional Box 13 1999 Functional Box 8 1999 Double Stack Box 1999 Blue Heart Box 1998