I like a lot of Goldsworthy's creations, but this collection is not among my favorites. It becomes boring because they're all too similar. In this case Enclosure refers to sheep folds that shepherds created to contain sheep, usually for counting, washing, safety, etc. They are often dry-stacked roofless enclosures with an opening to get the sheep in. There are many derelict folds around England and Goldsworthy uses this project to recreate them, usually in situ, sometimes newly created. It's interesting seeing them newly done, and then other photos later when left to weather. They're not for sheep, just for the look of the thing. Sometimes he has a cairn, or deliberately created pile of rocks inside or next to the fold to showcase the relationship of the different shapes, also dry stacked.
He notes the location, how to get to it if people want to, and who helped him create the folds and when.
Other "artwork" is a canvas laid on the ground with a food source on it. The sheep create the "artwork" with their dirty hoofprints and even dung. These are then hung like large paintings.
Much of the text is taken up with the affect the British hoof-and-mouth disease epidemic had on his ability to complete his works and on the farmers more directly affected.
There are a few other things shown, but I like best the other examples of his work in other circumstances and other books.
The weight of the text block has made it pull loose from the covers.
I wish our library had gotten a different book of his works.