‘He knows everything that’s happened fromB’reshis [Genesis] to today’, it went, ‘and it really isn’t work to him – it’s merely play’,a sentiment later expressed when one colleague wrote of Deutsch’s ‘game of cards’(Margolis, 1921).3
Apparently a colleague wrote about Deutsch's "game of cards" as a description of hit use of a zettelkasten. The play here is reminiscent of the joy Ahrens talks about when doing research/reading/writing (2017).