I had read about the story how John Lennon first "met" Yoko Ono. Supposedly, it was in an art gallery in New York City where Yoko Ono, an artist then, had had her work on exhibit. One of her installations was an interactive sort of work where the viewer, at this point the curious John Lennon, had to climb up a step ladder. When Lennon reached the top, he saw a placard or a piece of paper that had the word, "YES," written on it. To John Lennon, this message impressed him hugely, probably because of the period of time in which this incident had occurred - 1960 or 1970s(?). After his experience with the art installation, Lennon knew he had wanted to meet the artist. That's how he hooked up with Yoko Ono. I thought that was quite interesting.