A white adhesive rectangle stuck to the door of every fridge and washing machine in Europe. Seven arrows step down from dark green A to red G, the product's class sits in a black pointer beside them, and one bold number tells you how many kWh it burns a year.

Every millimetre, every CMYK value and both typefaces are written into law. This system keeps that discipline: white stock, sharp corners, a single comparable scale, and numbers instead of sentences.