The invention relates to an endoprosthesis for a shoulder joint comprising a rotating piece which is connected to a shaft part such that it can rotate around a first axis, and comprising an axial directional piece which is connected to said rotating piece such that it can rotate around a second axis. Those which are printed in a superimposed manner on the effect panel 813 are: the first picture 813a that is printed in an ordinary manner with the use of color ink ; and the second picture 813b that is printed with a polarizing pearl ink with its higher light transmission property than that of color ink. All of medium of optical elements which is disposed in a space between a most object side of the imaging system and the imaging device is constituted with optically isotropic medium. The mask includes a mask substrate having a patterned layer of blocking material formed thereon to define a high energy particle bombardment mask pattern. The invention further relates to highly branched polycarbonates having groups deriving from unsaturated fatty acids, to a process for preparing such highly branched polycarbonates, and to the use of these highly branched polycarbonates for improving the curing properties of coating compositions based on an aqueous acrylate dispersion.