“The Mysteries of libreriAdder”

In the world, there are various mysteries still unresolved.
Among all of them, however, there is one in particular, that of the libreriAdder.
That's right, this bookshelf was built by carving a niche into the wall.
Shortly after, strange space-time events began to occur.
Books that disappeared and books that appeared.
For now, the only explanation is that in that precise location there is an unidentified mini quantum distortion.
One day, this strange volume titled: “Angst+Pfister L'uomo e la tecnica” appeared.
But whose is it, where does it come from? Nobody knows! However, it is intriguing.
It's not a book, but a collection of plates depicting curious types of machines.
Soon, the content will be revealed...