Not until just recently did I take notice that the root of the words parentheses (noun, plural), parenthesis (noun, singular), and parenthetical (adjective) is thesis.
Huh.
Nor did I really know the etymology of the word thesis—late Middle English via late Latin from Greek, literally 'placing, a proposition,' from the root of tithenai 'to place.'
Parenthesis means 'a putting in beside,' from para- 'beside' + en- 'in' + tithenai 'to put, to place.
Yup, I'm putting one project in beside another.
A close-up glimpse of two of my parenthetical pieces in progress—
