Members of Library of Birmingham staff, council representatives and Carillion employees gathered in the dramatic rotunda which will house the five-storey book wall.
The rotunda, at the very heart of the library, features a series of cantilevered circular balconies each providing access to a different part of the shelves that comprise the book wall.
Escalators zigzag across the space, providing stunning views throughout the library and access for all to over 400,000 books, more than double the amount currently on show at Central Library.
More top news
Mist and fog patches are likely at first this morning, which may locally be dense.
A pensioner from West Bromwich has taken a picture on her phone of what she believes is a ghost.
A nine-year-old girl injured when a bus smashed into a supermarket, killing a pensioner and young boy, is in a life-threatening condition.