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People often paste stamps to send postcards to share their feelings with friends in some other places.
Lets transform the stamp to a piece of soil contented with seeds. The seeds sprout on the way to the destination. Receiving the postcard, receivers get a piece of grass, which can be taken out of the card and replanted into flowerpot.
In this way, our friends can smell the earth where the postcard sent from. So, we will have more fun sending and receiving postcards.
Cheng Qiying, Gu Shaoting, Cai Juexiao, Le Yiyan