As a pastel artist living in Western Colorado, I am familiar with taking my easel and going to the Colorado National Monument to paint. I started hearing about painting "en plein air" and thought that it was a new technique - like a loose style similar to Claude Monet. I felt foolish when I went to Wikipedia and read, "En plein air is a French expression which means "in the open air", and is particularly used to describe the act of painting outdoors". Wow, the thing we have been doing all along but with a fancy French name.
What are the benefits to painting en plein air?