The shape of this cup is a main sphere with 6 portions of spheres - of the same radius as the main one - removed to form concave faces. The top is open and a handle has been added. The dimensions of this cup are approximativaly 6.5 x 6.5 x 6.5 cm and its capacity is 10 cl making it suitable for an Italian expresso.
I used the 2D wave equation to generate the top surface of this tile. Random oscillators drive waves across the surface, reflecting from the edges and interfering as they cross each other. Like the ripples in a pond that it's designed to mimic I think it's beautiful, I hope you do too.