First, there was App Wall. Now, there’s Book Wall.

Merge Mobile is now doing to iBooks e-books what it has done to iOS apps. Its latest “wall” app is Book Wall, the follow-up to its previous release, App Wall. App Wall displays the icons of best-selling apps in a neat mosaic wall. Book Wall displays the covers of best-selling books in the same way.

By default, Book Wall generates a mosaic arrangement of the top paid books across all categories in the iBookstore. Currently the list, or, rather, the mosaic, is topped by all three titles in the “Fifty Shades of Grey” trilogy (the current talk of the town), a Harlan Coben book and Walter Isaacson’s Steve Jobs biography. You can also choose from a specific category and select either paid or free to see the top books in that category. For example, if you’re into bodice-rippers, a category of novels under which the aforementioned trilogy falls, you can’t go wrong with the Romance Paid filter. Book Wall also has options for filtering your desired view by maximum price or minimum star rating.

Book Wall reminds me of my favorite local bookstore's window display.

Although the highlighted feature of Book Wall is its ability to display a mosaic of book covers, it can also display simple lists that enable you to easily see the titles of the featured books. Book Wall is available now in the App Store for free. If you’re looking for something to read on iBooks on your new Retina display iPad, Book Wall has you walled up.