The references all point to the PostScript version of the picture mentioned.
Ant 2 with a symmetric pattern at time 368.
Ant 2 building a highway at time 10,647.
Truchet contours for ant 2 in the initial configuration at time 0, and at time 184, time 368, and time 472.
The Truchet contours for ant 9 at time 38,836, with the principal contour hilighted.
Ant 51 at time 309,479,304 (in color, with the Truchet contours overlaid).