I like! Interesting also is: What hook size did the creator use?
I was wondering the same thing. The largest hook I know of is a size "Q" and I've used that on rag rugs and rag baskets. (crocheting with strips of fabric) I have read about a lady in another country who makes huge knitting and crochet projects, but she made her own huge hooks as well.
Check out these links of people who knit and crochet with giant hooks and needles! I couldn't find the actual website I was looking for, but these are interesting. http://www.greendesignlibrary.com/2010/04/urchin-pouf/http://juliaknitwits.blogspot.com/2012/06/extreme-knitting-for-world-wide-knit-in.htmlScroll down: http://feathersfreesiasandfishingtackle.blogspot.com/2011/04/felted-gorgeousness-from-dana-barnes.html
Here's another one ... Ivano Vitali crochets/ knits recycled newspaper into amazing fashion using his own super big handmade hooks and needles:http://www.crochetconcupiscence.com/2012/01/ivano-vitali-turns-newspaper-into-crochet-art/
I've seen an S hook, which is a little larger than the Q. I love this idea! :) So much fun!