Originally Posted by Elfwreck
A google search for [flatland classic literature] turns it up on several websites; it's in the public domain, and popular enough to remain in print; Penguin books calls it a classic. It's often included in lists of classic science fiction books.
If "classic" means "widely assigned as reading in literature classes," that needs to be specifically stated. (Along with the def of "widely assigned." One of the google hits was an essay-mill site for students to download papers from.)
I agree that Colour of Magic is not a classic; the Discworld series may turn out to be, but I doubt any one book stands out as "a classic." (The Nancy Drew mysteries may be classics, but no one book is.) But if Flatland is not a classic, we definitely need a more specific definition of the term.
Agreed with all of that...