MARK is a device that acts as a physical reminder of the unread e-books in your collection.

Implementation
A reader is always conscious of the unread books in their collection because of their physical presence. Shelved on the wall or stacked on a desk, an unread collection can create a sense of anticipation or inspire a sense of guilt. E-books on the other hand remain hidden on a device that maintains the same shape and weight no matter the size of the collection it contains. Without the visual reminder, unread books can be quickly forgotten.
MARK is a device that gives physicality to digital media. Placed on a bookshelf or night stand, it scans a reader's digital collection and displays the titles of books they haven't finished, indicating their progress and the length of time since the book was last read.