To provide a use method of a polarization plate, a structure formed by using the polarization plate, a penholder, an ornament, a game toy and a case.

A space part closed in the peripheral direction is arranged in a part able to see a structure or an outer structure from the outside, and the polarization plate of displacing the polarization axis by 90 is installed on a floor part and both side walls for constituting this space part, the respective whole surfaces of the ceiling or two surfaces opposed in at least the horizontal direction, and is thereby constituted so that a false partition wall is visible in the space part when looking at the space part from the outside. The penholder, the ornament, the game toy and the case are constituted by using this phenomenon.