Milton Glaser's early book covers, done not long after he founded Push Pin Studios with Seymour Chwast, served as a kind of laboratory for the techniques and styles he was exploring in the late 1950s and early 1960s. Some covers feature fine, flowing line drawings and swaths of flat, bright colors that prefigure his ground-shaking psychedelic work of the late 1960s. Others contain overt nods to historical artists and art styles (a hallmark of Push Pin). Still others are more abstract or play with the illustrative qualities of type. Book jackets were the bread and butter of Push Pin during this period, and the sheer volume of Glaser's output offers a fascinating window into the inventiveness and adaptability that has always been part of Glaser's genius, even as a young designer.