A structure with variable geometric pattern and appearance which comprises: a first element having a first aperture whose outline defines a preset geometric or fancy figure; a flap or patch of fabric or cloth applied on the rear surface of said first element; a second element associated with the rear surface of said first element on the back of said fabric so that the said fabric will result interposed between the first and second elements, the same fabric being able to partly project from the surface defined by said first element or said second element, the surface of the latter being provided, likewise the surface of the first element, with one or more apertures; the said one or more apertures defining one or more writings and/or figures intended to result inside the area delimited by said first aperture and visible against the light through the cloth.