While museums the world over have gone on a binge of commissioning trophy buildings by famous architects, the Museum of Modern Art is going with basic modernism (at $425 million). “A museum is not architecture, and it is not a collection. It is both. A museum, in other words, should not compete with its art. The midtown Modern, scheduled to open in late November after being closed for two and a half years, is 630,000 square feet of straight walls, floors and ceilings with no obtrusive columns or dead-end hallways. It is a building with a harmonic precision.”