The idea to use Superman's cape, which came from Miles Millar, to represent Clark's "cosmic lifespan" came after much discussion on what to actually use. Ideas were thrown around, including a shot of Lex dumping kryptonite on Clark, as he is lying down, killing him. Ultimately they went with Millar's idea, which they saw as this "great iconic moment", because the audience finally sees their first glimpse of Superman's costume. Superman's cape was not the only iconic imagery used during the third season. The episode "Whisper" not only introduced a new superpower for Clark, his super hearing, but allowed the writing staff the opportunity to provide a sort of "in-joke" to the audience. The team wrote in a gag where Clark wears a pair of eyeglasses, a staple of his disguise later in life while working at the "Daily Planet". In the episode, an accident with Clark's heat vision causes him to go blind; as his eyes heal, he is forced to wear a pair of prescription eyeglasses until he fully regains his sight. "Perry" would introduce Clark's future boss, and editor of the "Daily Planet", Perry White. This episode would also serve as the point where Clark finally learns that his powers are caused by the radiation from Earth's yellow Sun.