What are the literary devices found in this poem below?Foundations Leopold Staff I built on the sand And it tumbled down, I built on a rock And it...

This
non-rhyming, short piece is more like a(not literally) or eastern poetic form than a typical
Western poetic form.  The short lines are succinct, built on archetypal symbols (sand and rock
and smoke), depicting a philosophical idea through what might be called synecdoche, in which
these three elements stand for all such objects.  The narrator is saying that the next effort to
build something will be based on things that rise up (smoke) rather than things that are
unstable (sand) or things that crumble (rock), things whose material qualities are illusions. 
Symbolically the narrator is saying that instead of relying on things of this earthly plane, he
will seek satisfaction in the ephemeral, the abstract, the spiritual.  The echoing of theof each
line suggests a parallel, in which the narrator achieves wisdom from his past construction
failures.