|This isn't really about arc or lisp or programming languages, but I made something I wanted to show y'all.|
I just came across an interesting article to syntax-highlight not keywords and other syntactic categories but variable names: https://medium.com/p/3a6db2743a1e
This idea has something in common with IDEs that highlight all occurrences of the word at the cursor. But it can certainly be valuable to see multiple words at once, or to see the dataflow without care for where the cursor is.
On the other hand, highlighting everything might be too noisy.
What to do? Think for a while, then see my solution: http://www.reddit.com/r/programming/comments/1w76um/coding_in_color/cezpios