Koestler seems to have been found boring, sexually, as often as overardent.
[XVIII, 2941, pp. 164–5; typewritten with handwritten postscript] Koestler replied on March 23.
Anyway, Koestler was no doubt happy to leave readers wondering if any writer could be trusted.
Koestler referred to the “logic of the moist eye” in The Act of Creation.