in reply to what does "\e[...." mean?

It's an escape code that may change the colour of the output text (depending on the terminal which the program is running in).

Voodoo really; use Term::ANSIColor instead.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In Section Seekers of Perl Wisdom