Libraries

Have you ever considered starting a library? A lending library I mean? 

We have been exploring this topic and discovered some fascinating kinds of libraries. When talking of a library, I usually think of books. There are, of course toy libraries for borrowing toys and games for short-term play to be returned and have the opportunity to take out something different.

Today I learned of another type of library, a seed library. Evidently it is becoming quite popular.I never thought of borrowing seeds before. If you borrow let's say ten seeds of a given plant, how do you return them? Don't the seeds germinate and then become a plant? Do you then return the plant?

It's a fascinating idea and topic. 

What other kinds of libraries are out there?