Yes, but I spent a lot of time working with PostScript at a very low level ages ago, trying to coax the best out of early printers — for those who are curious, the book PostScript Language Design (the “green book”) is excellent reading (and yes, I have the balance of them, red, blue, black and purple).
Decades ago an acquaintance offered a book to me about learning postscript. I declined, as I had to learn CAD. Only so much time in the day.