Views from the inside of balconies looking out and down, from German Romanticism, through Morisot and Caillebotte, to Corinth and Pierre Bonnard.
Heyerdahl
Views from a balcony, notably developed by Gustave Caillebotte in 1880, but continued in paintings by Lovis Corinth, and Pierre Bonnard.
Unlike Impressionism, which spread relatively slowly, Naturalism was prominent in the Salon, so spread across Europe and North America like wildfire.
The Eclectic Light Company 