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.
Also have a look to the Not So Concave Cup
Check my other designs for Glazed Ceramics