One person sits on a stool reading a book. The location is somewhere public where people can come and watch.
The work has a finite length – it is the time that it takes the person to finish the book.
The activity can be repeated as many times as desired either using the same person and book or different people/books etc.
The work can then be extended to having two persons reading. This could offer a contrast such as for example a university professor reading one book and a barmaid reading another. When they have finished they could swap books and start again.
This could be a display in a bookshop.