Washington Post columnist Katherine Salant has a nice piece today on her visit to Philip Johnson’s Glass House.

“From the photographs and frequently published floor plan, the house seems to be so simple — a box with four glass walls — that it could have been built from a quick sketch on a cocktail napkin. In fact, over three years, Johnson took the design through more than 70 sketches and 27 iterations before he arrived at his solution: two buildings that face each other across about 30 yards of grassy terrace.”

Here’s a nice Time slideshow with images of the various buildings Johnson built on the 47-acre site in New Canaan, Conn.