The bookshelf combines in a poetic way the pleasure to read with the object of the clock.
It gives the possibility to dedicate itself completely to the reading without restrictions of time...
There are millions of clocks around us.
The wall clock is always there, you see it all the time and you can do nothing. The power must return to the people.
When a person wants to have a moment of Ozio, for example while he/she is reading, he/she should be able to do that without any restrictions of time...
If there is the book on the shelf, his weight will push the clock forwards. If you take away the book the mechanism pushes the book backwards and you can see only the matt window.