Pseudo-LCD "digital" greeting cards

Remember the "faceless watch" yesterday? Here's the paper counterpart:

Unassuming greeting cards made from recycled paper have digital-style debossed fronts that, when filled in with marker, create robotic, '80s-futuristic letters and words. Write any message you'd like within the 2 rows of 8 grooved squares - the raised sections will guide your marker on the right track.

Credit, via Feingut.