When it comes to logo designers, you really couldn't hope for anyone more creative and prolific than the late, great Stefan Kanchev. During the second half of the 20th Century, he single-handedly put Bulgaria on the world graphic design map, pumping out hundreds and hundreds of logomarks, postage stamps, and other incredibly stylish and effective designs. Here is a collection of some of his best work. These images are from a series of photos from an exhibition of Kanchev's work found on…