A sampan is a wooden boat traditionally used in China as a fishing boat or for housing.
In fact, this traditional origami boat more closely resembles a very special Chinese boat called 乌篷船 (wūpéngchuán),
a rowing boat with black canopies. This boat can be found in precisely this shape, with two separated sun canopies, one in the front and one in the back.
The origami model tries to imitate these distinctive canopies.