Inspired by nature

Gachapon aka Toy Capsule Machines - 「ガチャポン」

Gachapon is toy capsules from coin dispensing machines. By turning the knob of the capsule machines to drop a capsule. 

So what inspired a Gachapon? 

Basically, it's just blind-boxes. They are similar to vending machines except the machines have a knob to turn in order for the capsules to drop. They are also known as blind purchase from a box because people do not know what will they get from the capsules when they turn the knob. The capsules are inspired by plastic bottle caps. 
(The name comes from the sound a machine makes: "gacha" when a dial is cranked and "pon" when the prize drops.)