Double signs comprising a thick support

A dual display comprising a front face in the form of an undulating sheet (9;

• 9′) that has a succession of troughs (6) and ridges (7), the left-hand sides (4) of the undulation turned to the left comprising a succession of sub-images, photographs, drawings or the like intended to form together an image, photograph, drawing or the like to be seen from the left, and the right-hand sides (5) comprising a succession of sub-images, photographs, drawings or the like intended to form together an image, photograph, drawing or the like to be seen from the right, and a support element (1) fixed to the rear surface of the undulating sheet (9;
• 9′), in particular by sticking, characterised in that
• the support element (1) is in the form of a block that has an undulating outer face of a form that complements the form of the undulating sheet and an inner face, the sheet (9;
• 9′) being fixed to the outer undulating face of the block and, measured in the direction perpendicular to the front sheet (9;
• 9′), the thickness (E) of the support element at the level of the trough the furthest away from the inner face is greater than or equal to half the smallest distance (e) between two successive troughs and ridges;
• the block being made of a plastic material;
• and
• the height and width dimensions of the block are such that the support element in the form of a block covers at least half of the rear surface of the sheet.