What is the fine-grained topic of the following text: The Mash-Ups are available directly from the artist as editions of 10 at 45 x 60 inches; a series of "home-sized" Graffiti Mash-Ups (editions of 6 at 27 x 36 inches) were created in January 2015 in response to various inquiries. Only return the topic.
Graffiti Mash-Ups Artwork Availability and Sizes