“Good design is honest.” So reads number six of the Ten Principles of Good Design, as carried down the mountain by revered industrial designer Dieter Rams. But it’s a principle that software designers seem to disregard, especially with one innocuous-looking feature of our digital lives: the progress bar.

Downloading, uploading, buffering, processing, progressing—this is the terrain of the progress bar, a symbol that an action is underway and we are at some quantifiable distance from its completion. We might encounter these glyphs when “standing” in a virtual queue, or filling out an online questionnaire.  On a small scale, they cater to two very human impulses: to imagine a goal, and then to accomplish that goal. It’s why people love crossing items off to-do lists or clea...