Would it surprise you that the thesaurus was written by an obsessive person?
Peter Roget, who wrote Roget’s Thesaurus, came from a family of mental instability: “His grandmother was mentally unstable, his mother was nearly psychotic and his sister and daughter had suffered severe mental breakdowns (Cracked.com, 2012)”
But, he loved to make lists. After 12 years of making lists of all words and their relationship to each other, he came up with the thesaurus.
For an interesting perspective on whether the printed thesaurus is going extinct, read popcorntheblog.com.
(Image from popcorntheblog.com)