Hidden away on NASA's Golden Record, an interstellar archive of music, image and sound, there is a recording of a poem by Charles Baudelaire, Élévation, which describes the astral ascent of the soul.
Well, part of a poem. Both to free up room on the disc and perhaps, to edit out "the vast sorrows and all the vexations" of the second half, only the first two stanzas appear.
The recording in fact ends halfway through a line, which conjures up an intriguing problem for the listener, inasmuch as the thwarted rhyme scheme reveals that the piece is incomplete.
A poetically-minded alien might be tempted to fill in the gap. A fancier alien who took a module in postmodernism might hail the poetics of the fragment.
A resolutely practical alien who thinks poetry is for losers might read the whole thing, instead, as a set of incoherent navigational prompts, made up of loose prepositions - au-dessus, au-dessus, par delà, par delà.