This old strip from October, 2001, seems appropriate somehow. I really didn’t set out on Monday to do this, but it seemed like an interesting idea when it dawned on me. All the cartoons I’m showing on the Web site this week appeared in early October, but they were drawn during the momentous week of Sept. 11. No one’s mind was on anything but the tragedies, really. I remember odd tidbits, like this one: it was reported that average temperatures in the United States spiked upward that week, presumably because the normally ubiquitous residue of vapor trails from commercial jetliners was absent, as airspace practically was shut down.