How about this for design-geek joy? Touch, a research project at the Interaction Design department at the Oslo School of Architecture and Design takes a look at the many incarnations of the dashed, or dotted, line:

Even though the dashed line has emerged from a designer’s shorthand and from the limitations of monotone printing techniques, it has a clear and simple visual magic, the ability to express something three- or four-dimensional in two dimensions.

In this fascinating piece we see the dotted line in illustration as representing hidden geometry, movement, paths, ephemeral material, borders and seams and consider its similarity with the ellipsis.

Found via the Design Observer.