Libre audio books. Recommended by Flancian.

Written before the Fedi times.

Collection of encrypted correspondence between the compiler and various correspondents, in approximately 150 alphabets, accompanied by transcriptions of the letters in Arabic. The compiler cites Shihāb al-Dīn al-Jindī al-ʻAlāʼī, Burhān al-Dīn al-Qudsī, and Taqī al-Dīn Muḥammad ibn Jaʻfar al-Ḥusaynī as authorities for some of the alphabets. The manuscript is incomplete, lacking its beginning and end. Occasional marginal notes. Some worm damage in margins.

Via https://t.me/linguopunk/549

Арабская книга 14 века с собственным тайным алфавитом для тайных записей

Viktor asserts that being a night person means that you go to sleep late not because it's your organism demand, but because it's your habit, id est it's your choice. I'm writing this as I'm transitioning to being an early bird.

Then he gives some motivational talk.