The defining character of impressionists, was their ability to paint in the moment. Prior to this period, mixing paints was difficult, and most art was produced

The defining character of impressionists, was their ability to paint in the moment. Prior to this period, mixing paints was difficult, and most art was produced in a studio. Industrialization gave readily mixed paints that lasted. This gave people the ability to paint outside, but since they would only have a few hours to capture a scene due to lighting, it encouraged essentially "Speed Paints." From there, its all about being able to capture as much of the subject in the least amount of effort. Art and technology and extremely linked. We take things like photo realistic paintings for granted, but these are only possible because artists can paint from a color photograph. Vermeers are celebrated because he was able to paint in a photo realistic manner before photos. But he was only able to do that with a complex setup of mirrors to essentially project an image on the canvas (or the eye using a split view setup).