David Sheff first met Yoko Ono in 1980 when Playboy commissioned him, then aged 24, to interview her and John Lennon. She asked him to send her his astrological and numerological charts before summoning him to the Dakota, where she and John occupied six apartments. (Elton John, a friend of theirs, wrote an excellent spoof: ‘Imagine six apartments/ It isn’t hard to do./