The poem's central themes are social isolation and a sort of disorientation that results from a lack of reference points. Of the many things that are stated to be absent or lacking, we can argue that the idea communication connects many of them. The poem presents an idea of being cut off from humanity and from nature too.
Formally, the poem is constructed as a series of negations. Almost all the phrases that make up the poem are noun phrases without a verb. (The verbs all appear as gerunds, essentially transformed into nouns, as in the phrase "No traveling at all.")
These negations are grouped by theme and move from broad statements of "No sun - no moon!" to more idiosyncratic or colloquial statements like "no 't’other side the way'" and back again to observations on people, movement/travel and nature.
