What sweet snack is named after a major '60s art movement?

In the early 1960s, Kellogg's biggest competitor, Post, invented a process for dehydrating food and enclosing it in foil to keep it fresh. Post announced its new product to the press in 1964 several months before they went to market, calling them "Country Squares". Because Post had revealed Country Squares before they were ready for the marketplace, Kellogg's rushed to develop their own version. They hired Bill Post, a former Keebler employee, for the task and created their own breakfast pastry in just four months. Initially called Fruit Scones, the name was soon changed to Pop-Tarts as a pun on the then-popular Pop Art movement.

Source: Wikipedia