Once upon a time Isaac was lounging under a tree in Euclid's apple orchard, when something struck his foresight.
“In the future,” he imagined, “the layout of these trees could help understand how to relieve an urban congestion problem.”
Our hero roughed out the idea on his mobile iTypewriter as you can see. What was he thinking?
________| : : : .' ________ red: g:een :red green red.' green red green .' | : .' : .' ..'' | : : : .' ..' ________| : : : .' .'' . ________ gr:en .' red: green red.' green red g..'' red..'' | : : : .' ..' ..'' | : : : .' .'' ..'' ________| : .' : .' ..'' ..'' ________ :red: :reen red.' green red..' gree..'' red green | : : : .' .'' ..'' ... | : .' : .' ..'' ..'' ...''' ________| : : : .' ..' ..'' ...''' ________ :g:ee: red.' green .'red..''green red...'''een red | : .' : .' ..'' ..'' ...''' | : : : .' ..' ..'' ...''' .....'''' ________| :: : .' .''..'' ...''' .....''''' ________ :.':red.' g..''.'' red...'''een red.....''''' red.......'''''' | ::: .' ..:.'' ...''' .....''''' .......'''''''.......:::::: |::: .' .::''...''' .....'''''.....'''''''...:::::::::.:::::::::::::: ________|::.:.:::.:::...:::::.:::::::::::::::::::::::::::::::::::::::::::::::: red:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
(Those dotty diagonals are meant to be solid, straight and thin. The lower portion is meant to show an increasing density of diagonals.)
Hint:
time ----------------------->