Knitting on two needles about a foot long takes time to complete. Imagine the time Sebastian Schoenheit, a German designer, took just to knit part of his carpet project using giant needles, almost as tall as himself.
It's not just the rows and rows of stitches, but what also impresses me is the even and well-formed stitching. His grandma would be proud of him.
The creation is both a piece of art and a performing arts piece where the knitter lies exhausted and buried under his work at the end, as shown in the final picture.