Display apparatus having means for creating a spectral color effect

A display apparatus comprising:

• a mirrored front surface having transparent portions formed therein, said transparent portions cooperating with said mirrored front surface to define a message being presented;
• a diffraction grating comprising a series of narrow slits or grooves which, by diffracting light, produce a large number of beams which interfere in such a manner as to produce spectra;
• a housing for positioning said diffraction grating behind and spaced from said front surface;
• a light source mounted on said housing in a position which will cause light produced thereby to impinge on and be diffracted by said diffraction grating whereby said light is diffracted into substantially all of the colors of the visible spectrum;
• said light source and diffraction grating being positioned within said housing in such a manner that said light diffracted by said diffraction grating passes through said transparent portions of said mirrored front surface, whereby the colors viewed by an observer of said apparatus change as the observer changes position relative to said mirrored front surface.