HoloSign does not show pictures projected by a projector: a fixed motif is deposited in the HoloSign screen. This motif is illuminated via a homogenous source of light (it can also be the sun) in highly intensive colors: the white light is diffracted into its spectral constituents by holographic optical elements (just like a rainbow). The colors generated change when the source of light or the viewer begins to move. This characteristic is extremely effective and perfectly suitable for the artful decoration of facades or for light advertisement.
The illumination facilities of G+B pronova GmbH allow the conversion of any given design into holographic displays, which are composed of a variety of small spectral colored pixels. Texts are also possible but certain colors cannot be maintained - as is frequently required in corporate designs, for instance - since the colors are variable.
HoloSign can be made of any glass (e.g. SCG). The color effects are not visible from the backside, which menas that even windows can be decorated with HoloSign. The windows remain transparent from the inside.