Envelope where Mt. Fuji and Mt. Fuji appear upside down / Mt.envelope

Only "OPEN" is written on the surface of this envelope. There are two perforations, from which the recipient can open the envelope. When you open the envelope, Mt. Fuji appears there. Inside is a paper card that looks like a mirror. By reflecting Mt. Fuji there, you can see Mt. Fuji upside down as if it were reflected on the surface of the lake. The back of the mirror card is white, so you can write a message on it. Please deliver Mt. Fuji and a small surprise to someone. Material: Paper Size: 105mm x 160mm Manufacture: Japan Design: Tomohiro Ikegaya (Japan)