The days of PHYSICAL books - I

As my readers know, most of books I read exist for me in electronic format.
So the encounter with great physical book is shocking and paralysing experiment.

During my last visit to Cracow and to its Jagiellonian University, I was fortunate to picture Copernicus' "De revolutionibus orbium coelestium":

No more words over this book....

The physical books will survive...