Helen Keller on lines

Helen Keller writes that what she calls beauty is “largely derived from the flow of curved and straight lines which is over all things”:

Helen Keller, The World I Live In (1908).

The book is in the public domain, available in print form from Google Books, the Internet Archive, and Project Gutenberg, and in audio and Braille from the Library of Congress. Our household has it in its New York Review Books edition.