Let’s see… Phones, calculators, computers, and almost every other number input device have THREE numbers to a row. This machine has FIVE snacks to a row, and they are numbered by the row, column grid. So what are the designers of this vending machine to do but put their number buttons FOUR to a row, of course!
This is the vending machine in my office. Entering the correct number for the snack you want requires an astonishing amount of mental processing. And when the snacks were free, there were always at least two unwanted items hanging out in the bin below.
