541 East 72nd Street, address of the late George Plimpton's apartment. I once enjoyed a 10-minute tête-à-tête with President Clinton here about his library in Little Rock--with him doing 90 percent of the talking.
In Ireland folks paint doors red to stave off malevolent spirits and ghosts, a tradition based on of Druidic superstitions. This door is at 182 East 75th Street.
Schools and barns were commonly painted red starting around the time of the Civil War because cheap, easy-to-come-by iron ore--ground fine--yielded the key ingredient for a pigment called Venetian red. These doors are at 45 East 81st Street.
When Model T's began to hit the road in the early 1920s--all of them painted black to make them as inexpensive as possible--fire departments started painting their vehicles red to stand out better. This fire station is at 157 East 67th Street.
During the era of the Underground Rairoad a red door supposedly represented a safe house. This door is at 126 East 78th Street.
A red door is also said to announce that a home is paid for, free and clear. Above is 326 East 69th Street, financial disposition unknown by me.
At 406 East 80th Street are these doors that date from 1955 and were designed by Brown-Guenther-Booss for the Convent of St. Monica, patroness of those who have difficult marriages, disappointing children and--fittingly for New Yorkers--are victims of verbal abuse.