Week 2: Coins, Codes, and the Myth of Simplicity
The vending machine as the simplest possible one-shot interface, and what its "simplicity" is quietly doing
1 March 2027 incentive
Outline
- why “simple” is a design claim, not a fact: a vending machine’s single slot and short menu hide slotting fees, price stickers set per location, and error states with no recovery path
- simplicity as a way to make a transaction feel too small to complain about
- reading a price sticker as evidence, not decoration
The argument
A vending machine looks like one of the simplest interfaces we encounter: choose an item, pay, collect it. But that apparent simplicity is produced by decisions that are mostly invisible to the person standing in front of it. Prices may differ between locations; products occupy fixed slots; errors can leave the user with money taken and no obvious recovery path.
Calling the machine “simple” therefore describes the experience the operator wants to provide, not necessarily the system itself. The fewer decisions the user sees, the less there appears to be to question.
This week treats the price sticker as evidence. What does it tell you about who set the price, who bears the consequences of an error, and what the machine expects you to accept without explanation?
Question to carry: when does simplicity stop being convenience and become concealment?
Teaching team
- Marisol Quaye — convenor