The next traditional kayaking skill?

This is a photo from the 1987 fall issue of Sea Kayaker. John Heath was probably the world's foremost authority on North Polar culture skin boats. Note the single blade paddle. The King Islanders used single blades, and large, wide, deep boats. And rolled them. With the single blade kayaking, there is much in common with the water ballet/freestyle that occupies a small nitch of canoeing. Single blades are now available commercially for kayaking, and would be simple to make as a do-it-yourself project. After all, you don't have to worry about making two blades that match!