“Souped up with the occasional easygoing intellectual-history insight, the comedy washes around on a roomy barroom set, with giant stylized scraps of scrawled-on paper floating overhead, to evoke the throes of genius. … It’s fun to watch Smith’s Einstein, who looks like a silent-comedy star and often brims with glee over insights or jokes that only he can understand. And Keenan’s egomaniacal Picasso is a delight.”