I'm very happy to send greetings to Stuart Kingsley,
my old friend Barney Oliver, and all those attending the
Conference on the Optical Search for ET. At the saiae time,
I'd like to tell you about an uncomfortable analogy that has
just popped into my mind. ...
Imagine a group of serious thinkers on a remote Pacific
island who've never had any contact with the rest of the
human race. Their technology is Late Neolithic, but they are
philosophically inclined, and they're debating the question
is there anyone else out there over the horizon? Unfortunately they can't go and look: a barrier reef right round
the island discourages boat-building...
Arthur C. Clarke,
"Let there be light!", Proc. SPIE 1867, The Search for Extraterrestrial Intelligence (SETI) in the Optical Spectrum, (6 August 1993); doi: 10.1117/12.150115; https://doi.org/10.1117/12.150115