I am back to reading books on paper for the moment.

That is Joshiraku manga on the right, and yes, I took a picture of its back cover by mistake. It is a limited edition that comes with a combo audio/data CD. The audio portion containes rakugo skits (of course!), and the data portion has an assortment of things, such as scripts in PDF, and wallpapers.

The wallpapers go as far as 1600 resolution, but all of them are in 4:3 format. What gives?