When she was in university, Allan’s down mom made a cool art book of three parallel lines that quickly become less so. Allan made a video of the book last year.
I liked the design and took screenshots from that video, glomming them together and tracing it in vector form in OmniGraffle, my favorite program ever. The output is nearly 5000 pixels long, so I took the liberty of rotating it below. (Click for a horizontal version of the book and the color lines.)
Look closely, and the secret of the Dulay Lines are revealed! (No, it is not a plan for future BART tunnels, I wish…)