Yes, you are looking at a knitted sculpture in the shape of a giant rock. The piece is in fact a giant replica of a smaller rock, a fragment of one of the Pyramids at Giza taken by a young boy (the artist) on a trip with his family (he did put it back... eventually). The backstory
on this sculpture is pretty interesting, if you have a moment to read about it << here
Andy Holden created this piece, in addition to some other knitted work shown below. Can you imagine how long it took to knit all of that fabric? That's a lot of surface area. I'm definitely going to keep an eye on his web site, in hopes of seeing more knitted medium used in the future.