I spent hundreds of hours of my childhood folding the fish, crustaceans and other sea life of this book. The shark exhibited on the front cover is a particular favorite of mine: it's one of those models that pretty much folds itself, perfectly balanced and eminently satisfying when completed. Some of these models are really hard. There is a deep sea angler fish with a full set of teeth that I made once on a family road trip, and I was pretty excited about that. Some of these models I've never made successfully. The crabs and the lobster at the end may be just a bit beyond me, although I always tell myself that I just haven't found the right paper. I think if you're willing and able to go beyond commercial origami paper, make your own paper or figure out exactly what paper works for you in the folding of complex origami models, you would be able to make any of these models. Lang and Montroll are two of the giants of the origami world, and this collaborative effort is well worth the purchase price. I just noticed that Robert J. Lang has a web site, http://www.langorigami.com/, where you can see pictures of a lot of these models, folded by their creator. Check it out! ( )