And this finer use of the senses, such as Stevenson cultivated, so that his life and works are beautiful as well as wise and good, we too may cultivate, and it is the object of this book to help us do it. I call it a guide to pictures, but I want to make it much more than that--a guide for the wonderful organs, your senses, that they may grow more and more to feel the beauty that is all about us in nature and in life, as well as in pictures and other works of art. So beauty is really our subject, beauty in nature and in art. The two are separate, though united as twin sisters.