Vintage neon 1967 stone rare Psychedelic Poster hidden message

Possibly could have holes, tape, bends, folds, and rolls from age and years of waiting for the next forever home. not currently in a smoke-free home, but......it comes from the straight '60s/70s, so who knows past life. I can't find anything on this poster not even Google Lens comes up with anything. lots of hidden messages and words but not sure what it is. size is about 36x24