And the reason for this, unless my car valet mysteriously is changing the oil and performing work which I'm not paying him for and I'm unaware of, is because perception is, in any case, leaky.
Y la razón es que, a menos que hayan cambiado el aceite en secreto, o hecho algo por lo que yo no pagué y de lo que no me he enterado, es porque nuestra percepción es imprecisa.