Matthew Might, a computer science professor at the University of Utah, writes: "Every fall, I explain to a fresh batch of Ph.D. students what a Ph.D. is. It's hard to describe it in words. So, I use pictures." It's September 26. That means fall is here again, and it's time to bring you an encore presentation of Matt's Illustrated Guide to the PhD. Have a look, and you'll see the whole undertaking in a less hubristic way:

Imagine a circle that contains all of human knowledge:

By the time you finish elementary school, you know a little:

By the time you finish high school, you know a bit more:

With a bachelor's degree, you gain a specialty:

A master's degree deepens that specialty:

Reading research papers takes you to the edge of human knowledge:

Once you're at the boundary, you focus:

You push at the boundary for a few years:

Until one day, the boundary gives way:

And, that dent you've made is called a Ph.D.:

Of course, the world looks different to you now:

So, don't forget the bigger picture:

Keep pushing.

You can find Matt's Illustrated Guide hosted on his web site. This guide/reality check is published under a Creative Commons License. You can also buy a print version for $6.50. (The money goes to charity.) Matt offers more insights for Ph.D. students here.