1. A security device, which comprises: a planar array of image icons, the planar array having an axis of symmetry within its plane, and the image icons having a repeat period within the planar array; and a planar array of image icon focusing elements, the planar array having an axis of symmetry within its plane, and the image icon focusing elements having a repeat period within the planar array, wherein, the planar array of image icon focusing elements is disposed in relation to the planar array of image icons at a distance sufficient for the image icon focusing elements to form at least one synthetically magnified image of at least a portion of the image icons, and wherein, the security device has a thickness of less than 50 microns.