Changeable display device

A changeable display device which comprises:

• a support member including a back wall and a frame;
• several generally flat display elements having first and second sides of contrasting first and second colors, respectively, said display elements being connected to said support member to form a two-dimensional array, each display element having a free-swinging edge and an opposite, attaching edge, each display element being rotatable about the attaching edge, said back wall being positioned to engage the free-swinging edge of each of said display elements when said display element is rotated in the direction of said back wall;
• and
• said frame including several mutually-facing first and second channels having first and second ends, each of said display elements including first and second projections extending from and being generally co-linear with the attaching edge, the first and second projections of each associated display element being operable to slide within the associated first and second channels, respectively, each of said display elements having a first display position in which the associated first and second projections are near the first ends of the associated channels and the first side of said display element faces said back wall, and having a second display position in which the associated first and second projections are near the second ends of the associated channels and the second side of said display element faces said back wall, said device further comprising front retaining means for retaining said display elements in one of the display positions.