Abstract: An item with a surface area creating an optical effect to increase protection against forgery is such that the surface area with the optical effect exhibits at least two images (12, 14) spaced a distance (d) apart. A first image (12) is situated on the surface (11) of a layer of material (10) and the second image (14) is virtual and, by holographic coding, appears to lie a distance (d) from the first image (12). By changing the angle of viewing, the optical perception of the whole image formed by the overlapping of the images (12, 14) changes, whereby the images (12, 14) are matched with respect to each other such that they demonstrate Moiré interference effects. A preferred application for the item is packaging, packaging material, packaging aids, bonds or entry tickets with forgery-proof and/or optically demanding surface area.

Abstract: A hipjoint socket having a metal outer shell (1) which may be anchored in the pelvis. The shell (1) includes regions (3) of greater wall thickness (D) alternating in the circumferential direction with regions (4) of less wall thickness (d). The regions (3) of greater wall thickness (D) are made as guideshoes for supporting bodies (11) which may be slid onto them. The supporting bodies (11) are fixed to and, if necessary, positioned exactly on the aforesaid regions (3) with fixing members (13). A number of supporting bodies, (11) which may differ in shape and dimensions, are associated with each shell (1).