"The illustrated guide to a Ph.D." by Matt Might is an interesting resource which I'd originally seen back in 2010.

Matt Might gives a great perspective on how the process of obtaining a doctorate may push at, and then break through, the boundary of human knowledge, thereby increasing the knowledge base, if even by a miniscule amount.

copy and paste links -
1) Matt Might, 15 page PDF, archived on WayBackMachine, 2010 (images only) - https://web.archive.org/web/20100821045946/http://matt.might.net/articles/phd-school-in-pictures/IllustratedGuidePhD-Matt-Might.pdf

2) MattMight.Net website, PhD School In Pictures, archived on WayBackMachine, 2010 (my favorite) - https://web.archive.org/web/20100815122612/http://matt.might.net/articles/phd-school-in-pictures

3) Open Culture article illustrates the doctoral degree process and is archived on WayBack Machine, 2012 (includes reader comments) - https://web.archive.org/web/20120927232652/https://www.openculture.com/2012/09/the_illustrated_guide_to_a_phd-redux.html

"Keep pushing."

Somewhat related, as the topic is a doctorate or doctoral degree:
PhD Comics (piled higher and deeper).
link - http://giftedissues.davidsongifted.org/BB/ubbthreads.php/topics/250405.html#Post250405