[PRL] Old parentheses just fade away

[Mitchell Wand]

I recall seeing a while back a page explaining how an experienced Scheme
programmer no longer "sees" parentheses-- he showed an example several
times, talking about it and painting the parens in lighter and lighter
shades of gray.

Do any of you remember seeing this?  I haven't thought of a good way of
searching for it.  I don't remember what the example was.

--Mitch
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