PURPOSE: To achieve the stereopsis of a photograph of greater size than stereopsis distance easily by folding an obstractive part of a photograph or figure to the reverse side.

CONSTITUTION: An obstructive part of a photograph or figure 1 is folded to the reverse side. In this case, the photograph is cut where its is to be folded, and the cut photographs are connected together on the reverse side with a thin film of an easily folded material, e.g., a cellophane adhesive tape 6 or Japanese paper. Further, those two photographs are placed at a position for stereopsis and fixed on one drawing board 5, etc., with the cellophane adhesive tape, etc., thus preventing them from shifting in position. Consequently, the stereopsis of a photograph of greater size than stereopsis distance is achieved without any expensive instrument.