The pasta shape that is the hardest to make is Trofie pasta.
Trofie pasta is a short, twisted pasta from Liguria, Italy and is traditionally made by rolling a small piece of dough diagonally across a board using your hand.
The irregular, corkscrew like shape of Trofie pasta requires skill and also practice to master.
The pasta that is shaped like a waterfall is Cascatelli.
Cascatelli pasta is a relatively new pasta shape that was designed by Dan Pashman.
Dan Pashman is the host of the Sporkful podcast.
The name cascatelli is derived from the Italian word for "waterfall".
Cascatelli pasta has a wavy, ruffled shape that has a curved, half tube that was designed and inspired by the cascading appearance of a waterfall.
Dan Pashman designed the Cascatelli pasta with a focus on maximizing the amount of pasta sauce that the cascatelli pasta can hold and deliver in each bite.
The shape of the cascatelli pasta also provides a pleasing textural experience with it's ruffles and hollowed out center.
And the design of the cascatelli pasta is also designed and intended to be easily picked up using a fork.