I'm unsuccessfully trying to go to sleep reading Iain M. Banks's science fiction novel Matter. His heroine is thinking of making a trip:
Even without consciously thinking about it, she was there with a diagrammatic … representation of this section of the galaxy. The stars were shown as exaggerated points of their true colour, their solar systems implied in log-scaled plunge-foci and their civilisational flavour defined by musical note groups …
An overlay showed the course schedules of all relevant ships and a choice of routes was already laid out for her, colour-coded in order of speed, strand thickness standing for ship size and schedule certainty shown by hue intensity, with comfort and general amenability characterised as sets of smells. Patterns on the strands — making them look braided, like rope — indicated to whom the ships belonged.
— Iain M. Banks, Matter, p 95
If you've ever tried to make a clear and informative transit map, look up at the night sky! Maybe somewhere out there, right now, unimaginable aliens are debating whether "schedule certainty" should be a hue, a pattern, or a smell.