[jcroberts]

uggh! The term "permanent" means "timeless," so a "timeless work" is the same as a work with "permanent impact."

As for me, I can do genus quality work, and occasionally I can even do species quality work. ;)

[j_baker]

Not necessarily. Timeless implies that time has no effect on it - it remains as important as it was when it was first invented. For instance, I'd say Euclid's work was timeless. Freud's work is permanent. It had a permanent impact on the field of psychology, but had to be built upon by other people to be effective.