“The 6,000 or so extant pages of text and drawings attributed to Leonardo da Vinci are thought to represent only about one-fifth of his output. Yet, remarkably, in a new show at the Victoria and Albert Museum here, just 62 yellowing sheets suffice to illuminate the endlessly curious and inventive mind of this quintessential Renaissance man. … [T]he display, which runs through Jan. 7, sets out to explore how Leonardo used paper to brainstorm about the mysteries and mechanics of life. And it reveals him to be an early master of lateral thinking.”