From Lewis Carroll Bio found this ex libris pic:
(a 1954 book)
The pertinent quotes:


Basically deliberate nonsense imitating life – imitating nonsense ….. null (like a dream)
“I’m very much afraid”, wrote Dodgson himself, “that I didn’t mean anything but nonsense!” -- and it is probably just for this reason that he succeeded in writing the longest and best sustained nonsense poem in the language.