A sign comprises a base layer (2) and a transparent or translucent upper sheet (3) over the base layer (2). An icon or indicia of the sign is associated with the base layer (2) or is printed on the upper sheet (3). The upper sheet and base layer are releasably adhesive together under pressure applied on the upper sheet such as with a blunt stylus, to cause the upper sheet and the base layer to adhere which in one embodiment causes the icon or indicia to be displayed and when the upper sheet is released from the base layer the icon or indicia is erased. In another embodiment the icon or indicia is displayed when the upper sheet is released from the base layer and is erased when the upper sheet is pressed to adhere to the base layer.