Stout achieved an ascetic sensuality in his geometric abstractions, a paradoxical synthesis of restraint and hedonism that is unmatched by any of his contemporaries.

There's a hidden drawing underneath the "Mona Lisa" — and it shows that this masterpiece almost looked very different.

Another work taps into the Mexican art convention of twinning sex and death. It's a conte and charcoal drawing of a headless female corpse who's sitting up in her gurney. A string of pearls is ...