This large-sized washbasin, made of artificial marble known as Corian, can be used as a shampoo bowl.  It allows seamless undermounting to a countertop made of the same material.
The opening of the bowl has a geometrical shape that blends in with an architectural space.  The cross section of the bowl has a shape that effectively receives water and reduces splashes during shampooing.  As shown in the drawing, soft contours appear in the bowl as it is filled with water.