Early pen and paper sketches that were used as the basis for the book cover of Harry Potter and the Prisoner of Azkaban are being sold in Scotland.
One of the pictures by illustrator Cliff Wright shows Harry and Hermione on a Hippogriff, the animal that's a cross between an eagle and a horse.
The other shows the menacing dog-like omen of doom, the Grim.
But they don't come cheap, being sold for almost £13,000 and £11,000 each at Glasgow's 14th annual art fair.
The Grim appears on the back cover of the book
Cliff Wright said his front cover design was one of a series of 10 that were sent to the publisher Bloomsbury as rough ideas for character development.
"The designs were also passed on to JK Rowling for her approval and any comments passed back to me," he said.
"For example, the Hippogriff was based on a design that was sent through to me from Jo."
Harry Potter and the Prisoner of Azkaban was first published in 1999 and is the third book in the Potter series.