To provide an illusional stereoscopic graphic form utilizing an inverse depth perception by changing a stereoscopic structure to various stereoscopic feeling according to an observing angle by providing a three-dimensional stereoscopic structure formed with ruggedness, forming shadows at protrusions of the ruggedness, plotting a depth line so as to see far or plotting that a recess part is bright and the depth line is near.

The illusional stereoscopic graphic form utilizing the inverse depth perception comprises the three-dimensional stereoscopic structure formed with the ruggedness. In this case, the shadows are formed at the protrusions of the ruggedness. The depth line is plotted so as to be observed far. Alternatively, the depth line is plotted so that the recess part is bright and the depth line is near. Thus, the stereoscopic structure variably varies its stereoscopic feeling according to an observing angle.