I once had an O'Really book named 'Perl/Tk'. I mean, I still have it somewhere... I've the feeling reading through it will maybe become my AI recovery therapy at some point?
Perl/Tk is a hard fork and hasn't fully integrated the improvements in Tk over the last couple decades.
Perl/Tk is a lot of fun. I wrote a solitaire game called tktk — Tk Time Killer — that appeared in The Perl Journal.
https://blog.gbacon.com/publications/2000-perl-journal-tktk/