Auction introduction: Christie’s presents American Atmosphere: An Important Private Collection, an online auction taking place from 27 September to 18 October. With a distinct emphasis on the inspiring effect of light and atmosphere in American art history, the collection boasts vibrant and diverse examples spanning the 19th and 20th centuries. Historic seascapes include notable paintings by leading artists such as Francis Silva, William Bradford and Edward Moran, while stunning examples of American Impressionism include works of Louis Ritman, Childe Hassam, Theodore Butler and Willard Leroy Metcalf. Headlining the sale is Ritman’s Hollyhocks, a superb example of the artist’s intimate and richly painted garden scenes, inspired by the work of French Impressionist master Claude Monet. Charming works across the sale will also be offered without reserve, representing tremendous opportunities for a range of collectors. The auction will be accompanied by an in-person exhibition in Christie’s Rockefeller Center galleries from 12 to 17 October.