HoloSign is a glass screen (transparent or mirror) and makes facades light up. HoloSign consists of holographic optical elements that break up white light into its spectral components and divert it to the observer. Glowing pictures and coloured designs appear on the facade.

HoloSign does not show pictures projected by a projector: a fixed motif is deposited in the screen. This motif is illuminated via a homogenous source of light (it can also be the sun) in intensive colours. The colours generated change when the source of light or the viewer begins to move. This characteristic is effective and suitable for the artful decoration of facades or for light advertisement.

Any given design into holographic displays is possible.