chromograms map text strings to color: the first 3 letters of a string determine the color of its representation. the 1st letter determines the hue, the 2nd letter the saturation, & the 3rd the brightness. although seemingly arbitrary, it actually reveals a series of important patterns in the editing activity of Wikipedians, such as so-called "systematic activities", or a sustained related sequence (e.g. alphabetical) of edits.