You can continue to enjoy the books and articles etc

They are just also used to create a new thing

In the picnic example, the picnickers can't use the lawn anymore.

As an aside: as somebody who lives in a dense area, I also would stay off the lawn. There's a utilitarian element where you have to rotate which lawns are used, and avoid using them when wet etc so as to maximize their utility. The picnickers should find a lawn that's open.