On Monday, Amazon Go, the company's new cashier-less mini-market opened in downtown Seattle, showing the world what retail shopping in the future could look like.

Instead of human cashiers managing checkout lines and registers, Amazon Go has automated the checkout process with sensors backed by machine learning that are watching you pick up and put away that can of soda. After swiping into the store through the company's app, shoppers are free to take items off the shelf and leave the store without needing to take out their wallets, because the app can bill you and send a virtual receipt.