The artist responsible, François Morellet, just turned 90 last week, a gallery representative informed me. Morellet, a father of conceptually inclined geometric abstract art, was also showing metal sculptures, two-dimensional compositions, and one neon-tube light work that featured a red bar alighting randomly across various sides of a square. A hanging light sculpture (“a minimal kinetic artwork,” the representative corrected me), fashioned out of perpendicular intercrossing pieces of metal to form a sphere, dates back to 1954.The two-dimensional compositions are selling for $35,000, while the metal kinetic works are priced at $120,000. How much is the wallpaper? The representative thought for a moment. “$80,000,” she said finally. Her partner added, jokingly, “These numbers are all randomized.”