Patti Smith and Robert Mapplethorpe in New York, 1970. Photos: Norman Seeff.

Patti Smith and Robert Mapplethorpe in New York, 1970. Photos: Norman Seeff.

Patti Smith and Robert Mapplethorpe in New York, 1970. Photos: Norman Seeff.

Patti Smith at photographer Judy Linn’s Brooklyn apartment, circa 1969. Photos: Judy Linn.

Robert Mapplethorpe and Smith at the ­Chelsea Hotel, circa 1969. Photos: Judy Linn.

Robert Mapplethorpe and Smith at the ­Chelsea Hotel, circa 1969. Photos: Judy Linn.

Mapplethorpe at the loft he shared with Smith on 23rd Street in New York, circa 1969. Photos: Judy Linn.