Canyon
Canyon
[Two guys, both Cueball-like, are standing at a cliff's edge.] Friend: What time is it?
[Cueball looks at his watch in silence.]
[Cueball looks up.] Cueball: Now.
[The full scene is shown: the two men (barely visible) are standing at the lip of a huge canyon in a rocky, barren landscape. A pock-marked moon and a ringed planet are visible in the burgundy-colored sky.]
[The two guys are again seen standing at what is now known to be the lip of the canyon.] Friend: That's a pretty boring answer.
[Same scene as before.] Cueball: Is not.
[Same scene.] Cueball: It's the least boring answer imaginable.

This is one of the early comics that explores a theme xkcd returns to often: the wonder around us, if we would just look.
Cueball and his friend (who also looks like Cueball) are having a discussion. After the friend asks Cueball what the time is, Cueball simply states that it is "now." Then there is a beat panel showing the two standing at the lip of a great canyon drawn in detail and color.
The friend claims that "now" is a boring answer, since it's a tautology , a functionally useless answer, and a bad joke all at the same time. Cueball, however, asserts that "now" is the least boring answer he could give.
It is typical for human beings to focus on mundane concerns, like a meeting they might be late for or a bus they have to catch, and take their familiar environment for granted, no matter how fabulous it might have been at first sight.
The title text explains that they stand on the lip of the canyon, which may not be clear if you do not look very carefully at the color drawing. There are two tiny stick figures at the edge of the canyon, near the center of the panel.  On the other six panels, there is just a ragged line, which thus obviously is this lip of the canyon.
[Two guys, both Cueball-like, are standing at a cliff's edge.] Friend: What time is it?
[Cueball looks at his watch in silence.]
[Cueball looks up.] Cueball: Now.
[The full scene is shown: the two men (barely visible) are standing at the lip of a huge canyon in a rocky, barren landscape. A pock-marked moon and a ringed planet are visible in the burgundy-colored sky.]
[The two guys are again seen standing at what is now known to be the lip of the canyon.] Friend: That's a pretty boring answer.
[Same scene as before.] Cueball: Is not.
[Same scene.] Cueball: It's the least boring answer imaginable.
