Userpic meme

[rhu]

There's a "meme" going around in which people explain their LJ userpics. Since I have a free account, I'm only entitled to six userpics anyway, so here they are.

	My default userpic is a visual representation of my NPL nom, 530nm330Hz. It represents an oscilloscope depiction of two waves.
	A two-year-old picture from my son's nursery school of him and me looking at their pretend Torah scroll. Used for religious posts.
	A "Simpsonized" picture of myself, using a picture that introverte took of me and processed by simpsonizeme.com when the movie came out. Used for lighthearted posts.
	My old xscreensaver image from MIT, it's an "inversion" of my nickname (Rhu) and my MIT logon name (amgreene). Used when commenting in the journals of people I knew in college, so they'll have some clue who I am.
	A capture from the MBTA (Boston) subway map, showing the Andrew station on the Red Line. Andrew, of course, is the name I'm known by IRL. Used for mass-transit-related posts.
	A closeup of my first (and, to date, only) NYT puzzle byline. Used for puzzle-related posts.