Plein air painting is the art of painting out-of-doors, on site, and completing the work at one sitting. This approach became famous with the advent of Impressionism in France in the 1870s. Light in atmosphere was the obsession of the early Impressionists, and their work, with its broad, quickly applied brush strokes and its fearless use of color, had and still has the power to astonish. Cathy Johnson has written a guide to this kind of painting for beginners and accomplished artists who use watercolor, acrylic, or oil. It is a celebration of the experience of making art, a primer on technique, and a call to see the great outdoors.