Cajal took the photos of Silveria that were referenced in the creation of this drawing. He did not, however, print them in juxtaposition. Whoever printed them would have done that approximately 15 years after his death. The paper that the photos are printed on was not produced until the mid-1940s. Despite that, I found the juxtaposition interesting and used the printed black and white images as a reference to create this work in color.