While visiting the National Gallery of Art I learned about an interesting little machine called the Camera Obscura: "Light from an external scene passes through the hole and strikes a surface inside where it is reproduced, upside down, but with color and perspective preserved. The image can be projected onto paper, and can then be traced to produce a highly accurate representation." Many variations of the camera obscura have been used for centuries. These artists were getting their basic outline by TRACING. And it wasn't cheating. I love this revelation as I have traced photos (cameras are just a modern Camera Obsecura with a way of keeping the image) to get basic shapes and perspectives on drawings and I thought I was cheating . Turns out I was just following in the footsteps of Canaletto and Leonardo Da Vinci!