“For several months in the winter of 1816-1817, Julius Schnorr von Carolsfeld vied with his friends, brothers Ferdinand and Friedrich Olivier, in making precise drawings of dried leaves.”
National Gallery of Art
Thanks to http://illustrationart.blogspot.com/2010_12_01_archive.html & http://gardenhistorygirl.blogspot.com/2012/01/portraits-of-dried-leaves-by-friends.html