This was a fun book to work on. I had read some of Brendand Connell’s Dr. Black stories over the years and gotten to be friends with him. We talked about some of the things he was looking for, one of which was a geometric look to the cover art. I looked at different images, thought about different treatments. It occurred to me to look for ceramic wall tile, which led me to a moon-like tile by the Kenzan company. I played around with an image. Brendan liked it. A friend of his in Japan contacted the company and got permission to use the image.