Subtle, and playful too, especially in those first four couplets leading up to the 'invocation' - perhaps anti-invocation would be more exact - of Sisyphus.

keeping pace
with kicked stones,

Hah! The whole piece a very poignant celebration of the mundane and, at first glance, unimportant. I'm sure there's more references going on later in the poem but my knowledge stops at Sisyphus unfortunately..