And when you look at people's brains as they're looking at colors -- say you have colors shifting slowly from light to dark blue -- the brains of people who use different words for light and dark blue will give a surprised reaction as the colors shift from light to dark, as if, "Ooh, something has categorically changed," whereas the brains of English speakers, for example, that don't make this categorical distinction, don't give that surprise, because nothing is categorically changing.
I quan mirem el cervell dels que estan observant colors — posem per cas un blau clar  que s'enfosqueix lentament — al cervell dels que fan servir diferents paraules per blau clar i blau fosc hi haurà una reacció de sorpresa quan el color passa de clar a fosc, com "Oo, alguna cosa  ha canviat de categoria" mentre que al cervell d'un angloparlant, per exemple, que no fa aquesta distinció, no hi ha la mateixa sorpresa, perquè res està canviant de categoria.