It’s precisely this inevitable erasure that makes MOMA’s decision to devote an entire gallery to a single Ono book—“Grapefruit,” her 1964 compendium of conceptual-art instructions—feel ...

Yoko gave John “Imagine,” and her association with John gave Grapefruit a second life. Fifty years after its initial publication date, it’s regarded as a seminal work of conceptual art—an ...