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
It's an unprecedented move by the council, who will use reserves to balance an estimated £38million black hole in its 2016/17 budget.
Baby Isabelle may never regain sight and will have to be fed by a tube for the rest of her life.
A book that has been missing from a Hereford school library for more than 120 years has finally been returned