The truth is that no one should be a "plein air painter" or whatever the heck that is suppose to mean. I despise the fact that it is even a term people have branded and turned into this big so called movement. No painters from the past, including the impressionists were even close to the lame philosophy you see now with these "purists" walking around creating rules. Even Monet did many of his paintings from memory in the studio (waterloo bridge series among them)/. Back then plein air was a tool you used in the creation of your landscapes, it wasn't a movement, it simply meant going outside to paint and study. Now it's a bunch of morons running around using it as a marketing tool to sell their art by claiming they "only paint on location". Often their art sucks as well!