The big, white gas guzzler has a yellow licence plate. That means the owner paid about 30% less than a person who bought the same car on standard plates. There are no rear seats in the Audi, a condition of yellow plate ownership. They are meant to be vans.
What once passed for normal, becomes a rarity (think: Renault 12). Usage debases the value of language so while our words remain set on the page, the meanings attached to them drift off and new meanings, hunting for home, attach themselves. So it is that the world outside our head is unstable and shifting and the words inside our heads lose value like sweating gold coin in a sack or drachmas, lire and roubles in wallets.