A collection of sophisticated cartoons, most of which originally appeared in The New Yorker, divides itself into five worlds -- the Artist's, the Arab, the Mythological, the Costume -- and the Rest of the World. And each offers some fresh ideas and cockeyed views of homo sapiens who can also be sappy. There's a Steinberg whirliness to his full page pictures while some of his spot pieces have a decisive firmness and there are others which vary in effect. Few are captioned- the humor is in the drawings' antic notions. On the caviar side.