Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. En plein air is a French expression which means "in the open air", and is particularly used to describe the act of painting outdoors. Artists have long painted outdoors, but in the mid-19th century working in natural light became particularly important to the Barbizon school and Impressionism. The popularity of painting en plein air increased in the 1870s with the introduction of paints in tubes (resembling modern toothpaste tubes). Previously, each painter made their own paints by grinding and mixing dry pigment powders with linseed oil. The Newlyn School in England is considered another major proponent of the technique in the latter 19th century. It was during this period that the "Box Easel", typically known as the French Box Easel, was invented. It is uncertain who developed it first, but these highly portable easels, with telescopic legs and built-in paint box and palette, made treks into the forest and up the hillsides less onerous. Still made today, they remain a popular choice even for home use since they fold up to the size of a brief case and thus are easy to store.

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