...
Book format:
The item’s primary content is textual (or wordless with relatively flat pictures)
The item’s format is that of a “regular” book (has page(s) of some kind)
Visual Materials format:
The item’s primary content is non-textual
The item is a deck of cards, kit, 3D object, or other non-book format
Remember that these categories are fluid!
Use cataloger’s judgment and respect the decisions made by other catalogers
And use other formats if they better suit the Artist’s book
...