Poster for glass surfaces - has sheet with small perforations to render it transparent when viewed from one side

摘要

The publicity display is for a glass surface and does not obscure the glass, i.e. on a public service vehicle. It is a poster which, when looked at straight and from several metres ahead, appears to be printed. It is perforated and when looked at from its rear, towards the light, is transparent due to light diffraction. The poster is made of light material such as paper, or thin synthetic material, and is smooth or woven or a mixture of the two, and suitable for colour reproduction.