This would appear to be the Moguntian equivalent of the Hollywood Walk of Fame.
Take your favourite book and squish it in the wet concrete.
Keeps your hands from getting mucky, that’s for sure…..
Making a mark – #1160
17 Nov
This entry was published on 17 November, 2010 at 12:00. It’s filed under Culture, Gutenberg Museum, Mainz, The gates of the Gutenberg Museum and tagged Johannes Gutenberg.
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Mainz Daily Photo 
>Beautiful! And lovely to get the full story on the following day. Well, kind of…
>Super cool! Would be well worth a mention on the interesting website of the Gutenberg Museum, which could include answers to all the questions…
>The wall itself becomes "art" or "art of the mark" and so does your photo! It appears to be old (more than 100 years) and created all at once. Tell me more, s'il te plaît.Bises,G
>Are they indentations from plates used to print books? Very strange, however created.
>what a great idea however created
>But the pages/cover of a book wouldn't make an indentation JB. Go back and find out how and what svp.V