Echoes in Time by Andre Norton and Sherwood Smith. I was contacted to do the cover for the reprint ebook edition. It’s a science fiction novel about time travel, but the method of travel in this particular book is through a glowing orb, which gives it an air of fantasy. I added the futuristic clock motif to the top to suggest the science fiction elements of the story. I ended up using the orblike shape again on the other cover in the series that I did, Echoes in Time, to draw them together thematically, as you can see below.