palimpsest
(en)
a manuscript or piece of writing material on which the original writing has been effaced to make room for later writing but of which traces remain
Perhaps Facebook no longer fully understands its own tangle of algorithms--the code, all sixty million lines of it, is a palimpsest, where engineers and layer upon layer of new commands.
this is true, I don't even understand how Macro works and I wrote all the (much fewer lines of) code myself
notable
7 years ago