The Final Flourish

S1 E4: In the final part of this dazzling BBC documentary, Waldemar Januszczak takes a closer look at the late years of Impressionism. He learns how new discoveries in light and optics influenced their work, while the deterioration of Monet's eyesight led to a seismic shift in his painting. But what was the ailment that drove Impressionism into a bold, radical direction at the turn of the 20th Century?