A building doesn't tell its designers whether or not the people inside like being there, and the toy manufacturer doesn't know if a toy is actually being played with — how and where and whether or not it's any fun.
Un edificio no les dice a sus diseñadores si la gente que está dentro lo disfruta, y el fabricante de juguetes no sabe si se juega con cierto juguete, cómo, dónde, y si es divertido o no.