The poem is built around absence. The speaker lists things that should be complete but aren't: a kingdom without a king, a sky without stars, an ocean without water, a fire without heat. Each one is hollow in the same way, a shape with its center missing. The title, "Can I?", hints at what's coming, because the speaker isn't just describing this empty place but asking whether they can reach it.
The middle questions are the most revealing. "Is it warm? Is it bright?" sounds almost childlike, as if the speaker has never seen the place and is imagining it from the outside. The idea of "never ending sunlight" is interesting, since it pictures something beautiful, yet the poem's own images suggest it might be the opposite. The speaker seems unsure whether this emptiness is comforting or frightening.
The mood is quiet, curious, and a little eerie. The closing questions, "Can I feel it? Can I go? Can I see it?", read as longing, though the poem never says exactly what the speaker is longing for.