TIL that one of the earliest examples of ASCII art appears in "Alice's Adventures in Wonderland" by Lewis Carroll (1865): Chapter III includes "A Long Tale" in the shape of a mouse's tail.

https://github.com/khrome/ascii-art-docs/blob/master/History.md

https://www.reddit.com/r/todayilearned/comments/15iip0r/til_that_one_of_the_earliest_examples_of_ascii/