You think you're a coffee connoisseur? Well then, you should have no problem ordering your pick-me-up of choice from this menu, which lists drink options purely by the ratios of coffee, milk, water and air.
The menu was spotted in East London, according to Flowing Data, and it relies on customers' knowledge alone. Alienating and over-exclusive, for sure.
Actually, it's unclear whether the menu is complemented by something more conventional -- for the sake of the cafe in question, we hope so -- but it's a neat concept, and in some ways a good way of choosing drinks based on physical preferences. Can you work out what all the choices are?