The gutter is where the two sides of an illustration meet and fold into the central binding.

In a systematic way, I am researching the wrting and illustrating career of Tomie dePaola. When I started this project, I was simply trying to think of a way to honor dePaola on his birthday–September 15. The prolific picture book author and illustrator Tomie dePaola was born on September 15, 1934. After I began my…