The album opens with "Muchacha (ojos de papel)", one of the most celebrated songs in Argentine rock history. Spinetta dedicated the song to Cristina Bustamante, his girlfriend at the time, and has compared the romantic ballad to songs like "Tu nombre me sabe a hierba" by Joan Manuel Serrat and "Julia" by the Beatles. Musician Alejandro del Prado described its lyrics as "almost pornographic at the time", citing phrases such as "pechos de miel" and "quédate hasta el alba" ("stay until dawn"). The length of the nine-plus-minute "Color humano", written by Edelmiro Molinari, concerned the record label since it precluded radio play. The jazz-inspired jam session is composed of two relatively short vocal segments surrounding a five-minute guitar solo by Molinari. The ballad "Figuración" is characterized by its use of the recorder, played by Del Guercio. Rolling Stone Argentina considered that the track, "anticipates certain ways of Sui Generis although in the final chorus the deep voice of Pappo and other boys of the environment known as 'Circus' are noticed." The lyrics of "Figuración" have been described as metaphysical, with Spinetta urging the listener to disfigure themselves. In "Ana no duerme", a sleepless girl is restlessly waiting; its lyrics refer to the need of many teenage girls to repress their sexuality. Spinetta described the title character as "that being that is always waiting. That girl who hopes to be loved, who expects a little bit of friendship, of understanding, who wants to leave her vulgar world of womanhood, who wants to occupy another place. [...] At that time, a girl of 16 or 17 was not the woman she can be today." The strongly paced track, with a rhythmic shift representing the "interrupted dreams" of the title character, has been compared to Pink Floyd's "See Emily Play" and is considered "the most rocker moment" of the album.
