Sharing books at work?

I had noticed that bookshelves have been installed in the common room of my workplace. I was wondering why. Now I know, as there was a paper explaining it: it is a sharing book scheme, people bring books from their place they don't read anymore and they place them on the bookshelves. There are a few titles already, different subjects.

I think it is a lovely initiative, but I am hesitant to participate, for a stupid and selfish reason: I don't like to share books much. Most of the books I own, I want to keep them. The very few I will not go back to it, I am still reluctant to tkae them off my bookshelves. What if I want to reread them to check if I was right about them in the first place? And there is a question of pride as well: I can abandon a book I really didn't like, I can give it to charity, but I would not want people from work to know I own it. However, I will make an effort and offer some of my books for the scheme. I guess there are a few titles I can give away for a bit with neither suffering nor shame. I will do it because people don't read enough and this is a great way to get people reading. And I do believe there is not sharing more generous than sharing a book.