A hologram comprises a holographic layer stack including a holographic layer, holographic structures being formed in the holographic layer, and a functional layer, wherein the functional layer is configured to change its optical properties when being exposed to an environmental influence, wherein the holographic layer and the functional layer are stacked. The hologram may be attached to a device, for example, an electric mobile device. Examples of the electric mobile device comprise a mobile phone, a personal digital assistant, an MP3 player, a camera, and a watch.