From a Boston Globe obituary for Andrew Lewis, an Oscar-nominated
screenwriter who reportedly died at 92 on Feb. 28, 2018 —
"A service has been held for Mr. Lewis . . . ."
— Bryan Marquard, Globe staff, April 5, 2018
From this journal on the reported date of his death —
The Globe reports that Lewis's father was Clarence Irving Lewis,
a professor of philosophy at Harvard University.
Fact check: See page 246 of C. I. Lewis: The Last Great Pragmatist ,
by Murray G. Murphey (SUNY Press, 2005).
Figure (a) above is not unrelated to philosophy. See Plato 's Meno dialogue.
See also a different diamond — a symbol devised by C. I. Lewis for use in
modal logic — in the post Wittgenstein's Diamond (July 10, 2011).