風船マウス。[A balloon mouse]

Blow-up Mouse by Bongkun Shin, Heungkyo Seo, Jiwoong Hwang & Wooteik Lim

空気を抜いて２つに折ると、胸ポケットに入る大きさ。すばらしい！
When let air, and fold it into 2; size to be in the breast pocket. It's splendid!
Souce...