You can see some of the content there. It's not very explanatory though. Just sentence-free fragments of text without definitions. "Valvable"? What's that? I can't believe people are funding this. Just draw your napkins, photograph them, and put up a web site.
On four napkins, apparently. And you can't see them because this is a kickstarter for a product that appears to be just those four napkins (not, say, a promo freebee for a larger on-a-napkin explanations project)