"Which art school could teach Guerin two such disparate skills? Or was it just natural talent? ...In 1889, Guerin's mother was renting out a spare room in their home when a young artist named Winsor McCay showed up at their door.... McCay and young Guerin soon became friends, and McCay taught Guerin his special techniques for drawing in perspective. McCay went on to create the revolutionary comic strip, Little Nemo..." http://illustrationart.blogspot.nl/2010/11/training-of-jules-guerin.html